Brain teasers

1. Why don’t good horses turn around? All the grass in the back has been eaten away.

2. Why is summer vacation longer than winter vacation? Thermal expansion and contraction

3. Why do wild geese fly to the south in autumn? It would be too slow to walk

4. Why do most Buddhists live in the northern hemisphere? Namo Amitabha

5. Why does the Statue of Liberty always stand in New York Harbor? She couldn't sit down

6. Why did the frog lose to the dog in the swimming competition? The frog committed a breaststroke foul

7. A dog never takes a bath, so why doesn't it get lice? Dog begets dog

8. Why can Lao Wang’s horse eat Lao Zhang’s elephant? They are playing chess

9. Xiao Zhang never walks without his feet touching the ground. Why is this? Because Xiao Zhang is wearing shoes

10. The farmer raises 10 cows and only has 19 horns. Why? There is a rhinoceros

11. Xiao Ming’s grandfather was brushing his teeth and singing at the same time. Why? Brushing dentures

12. Why did a ferocious hungry cat run away when it saw a mouse? He ran over to catch her

13. Xiaohong and her mother are both in the same class. Why is this? Mom is a teacher and Xiaohong is a student

14. Why does the roof of my neighbor Lao Li’s house sometimes leak and sometimes not? It only leaks when it rains, but of course it doesn't leak when it's sunny

15. Why do two tigers fight to the death and never give up? Because no one dared to break up the fight

16. The big bad wolf dragged away the mother sheep. Why did the little sheep follow silently? The lamb is not born yet

17. A chicken and a goose are placed in the refrigerator. The chicken freezes to death, but the goose is alive. Why? It's Penguin

At 18, Xiao Chen went to see a movie on the weekend. When he arrived at the cinema, he couldn't see anyone. Why? People are all one by one, not half of them

19. What line do monkeys hate the most? Parallel lines, no intersection (banana)

20. Xiao Ming’s belly is clearly unbearably bloated. Why does he keep drinking water? Fell into the river, forced

21. There were six steamed buns in the basin. Each of the six children was assigned one, but there was still one in the basin. Why? A child was carrying a basin

22. Xiao Ming brought 100 yuan to buy something worth 75 yuan, but the boss only gave him 5 yuan. Why? Because he gave the boss 80 yuan

23. There was a monkey squatting on the telephone pole on the roadside. When the driver Xiao Li saw it, he stopped the car immediately. Why? Because the driver used the monkey's butt as a red light

24. Xiao Ming always likes to break the alarm clock at home. Why does his mother always ask his father, who cannot repair clocks, to repair it for him? Repair Xiao Ming

25, Xiao Li needs to socialize a lot due to work. Although he goes home early every day, his wife still complains constantly. Why? Because Xiao Li comes home early every morning

26. Pangpang is a famous diver, but one day, he stood on the springboard but did not dare to jump down. Why is this? Because there is no water underneath

27. A taxi was driving normally on the road without violating any traffic rules, but it was stopped by a police officer. Why? pol.ice requires taking a taxi

On the 28th, a plane crashed and a serious explosion occurred. The staff was cleaning up the wreckage but no one was found injured. Why? All dead

29. There are two children who look exactly the same and have exactly the same birthday. I asked them if they were sisters and they said yes. I asked them if they were twins and they said no. Why? They are multiples

30, there is a woman in a swimsuit walking on the soft beach. Although all this is normal, you will find that there are no footprints behind her. Why? She was walking backwards

31. Xiao Wang and his parents traveled abroad for the first time. Due to the language barrier, he seemed at a loss. Xiao Wang didn’t understand foreign languages ??either, but it felt like he was at home. You feel inconvenienced at all, why? Xiao Wang is a baby

32. What are you afraid of cloth and paper? cloth(not)

Afraid of 10,000, paper (only) afraid of just in case

33. What does China’s mainland produce? "Jade"

34, how can I find the lost thumbtack immediately? Step on the ground with bare feet

35. On any part of a woman’s body, her father can touch her twice, her boyfriend can touch her once, but her husband cannot touch her once.

Lips, when saying the words "dad", "boyfriend" and "husband"

36, what is something smaller than bacteria? The Son of Bacteria

37. Which book has the most mistakes? Medical book

38. What animals can be posted on the wall? Seal (newspaper)

39. What are you afraid of with cloth and paper? Don’t be afraid of ten thousand, just be afraid of the eventuality (cloth is afraid of ten thousand, paper is afraid of the eventuality)

40, who is Hongdou’s child? Southland (Red beans give birth to Southland)

41. What is the first thing people do when they wake up in the morning? Open your eyes

42, what chicken has no wings? Frog

43. What can you hit that is both effortless and comfortable? Doze

44. What water should be distributed as planned? Salary

45, what product has the manufacturing date and expiry date on the same day? Newspaper

46. What color are the teeth of babies born to black and white people? Toothless

47. What is something that people don’t like to eat? Suffering a loss

48. The whole body of a pig is a treasure and has many uses. What other uses does a pig have for humans? Swearing

49. What books can’t be bought in the bookstore? Suicide note

50. What flower blooms all year round? Plastic flower

51. The diameter of a round hole is only 1 cm, but an object with a volume of 100 cubic meters can pass through this hole smoothly. What is it? Water

52. What animal has no sense of direction? Elk (lost)

53, vixens are best at bewitching men, so what kind of "spirits" can bewitch men and women together? Alcohol

54, which ancient man ran the fastest? Cao Cao (Say Cao Cao and Cao Cao will come)

55. The train takes 6 hours from Beijing to Shanghai and travels for 3 hours. Where is the train? On the Rails

56, when does the clock go? The clock won't move

57. There is something that people who buy it know, people who sell it know it, but only people who use it don't know it. What is it? Coffin

58, what is the function of eggshell? Wrapping egg whites and egg yolks

59. What should everyone do seriously every day? Breathe

60, what kind of car can move easily? Windmill

61. What kind of competition does the winner get no prize but the loser does? Rowing fists and drinking wine

62. Where in the world does the sea not produce fish? Cihai

63, what kind of bamboo doesn’t grow in the soil? Firecracker

64, what should you do if you put nine horses in ten horse pens on average and make the number of horses in each horse pen the same? Put nine horses in a horse pen and then put nine more horse pens outside the horse pen

65. If a person wants to become a millionaire overnight, what should he do? Dreaming

66, how to use three chopsticks to form a number that is larger than three and smaller than four? π

67, a bottle full of milk, how can you drink the bottom of the bottle first? Using a straw

68. How do blind people eat oranges? Bullshit

69, what should I do if I accidentally overcook the uncooked rice? It’s time to eat~~~

70. What should I do if I want to shorten a stick without sawing, breaking or shortening it? Compare it with one that is longer

71. The kindergarten is over, but no children have gone out from the gate. What's going on?

72. Confucius had three disciples: Gong, Zilu and Ziyou. Which one of them is not a human being? Zilu (referring to a deer as a horse)

In 73, there were four people playing mahjong in the room. A police officer took the four people to the police station. Who is the remaining person in the room? A man named Mahjong

74, can a blue pen write red letters? Of course you can write the word "red"

75, can you turn ice into water as fast as you speak? Remove the two dots of water from the word "ice"

76. In winter, the baby is afraid of the cold and refuses to take off his hat when he gets to the house. But when he sees a person, he takes off his hat obediently. That person is

who? Barber

77, which month has 28 days? There are 28 days in every month

78. A group of women were bathing by the river. Suddenly a strange man broke in. What do you think they wanted to cover the most? That man’s eyes

79, a bull and a cow, guess three words! Two Cows

80, how long does it take to finish studying at Peking University? One second is enough

81. Which tooth will grow last? Dentures

82. Iron will rust if left outside, but what about gold? Stolen

83, what is a reasonable way to divide 6 oranges among five people? Squeeze it into orange juice and divide it into pieces

84. For fear of losing shape, what do you call a beautiful woman who does not have children after marriage? Peerless Beauty

85, a number after removing the first number is 13, and removing the last number is 40. What is the original number? Forty-three

86. How come there is a hole in the newly bought socks? How can you wear it without holes

87, there is a word that everyone will pronounce incorrectly? What is the word? Wrong

88. When the car turns right, which tire does not rotate? Spare tire

In 89, a man got on the single-plank bridge, but at this time a tiger came from behind, and there was a snake in front, and there was a cliff below. How did he get over in the end? Fainting

90. There is a cow with its head facing north. It turns three times to the right, then turns two times to the left, and then turns to the right again. Where is its tail facing at this time? Downward

91. Why do egrets always sleep with one leg curled up? I fell down with my two feet shrunk

92, I dropped my ID card, what should I do? Pick it up

93. What will the unicorn become when it flies to the North Pole? Ice Cream (Ice Kirin)

94, among the butterflies, ants, spiders, and centipedes, which one did not get paid? Centipede, no merit (centipede) will not be rewarded

95, 123456789 Which number is the most diligent and which number is the laziest? 1 is the most diligent and 2 is the laziest (if you don’t do one, you will never stop)

96. Is the candy male or female? Female, because it will give birth to ants

97. A mother gave birth to conjoined twins. The sister is called Mary. What is the name of the sister? Monroe, Marilyn Monroe

98, which one is worse, elephant skin, tiger skin, or lion skin? 99. Which one of the stars, the moon, and the sun is dumb? Stars, the song has "The stars in the sky don't speak"

100, which house has the narrowest road? Enemies (enemies meet on a narrow road)

1 What will the wine that has been buried in the ground for a thousand years be called when it comes out?

Answer: alcohol

2 There is a pig, it walks Oh, let's go and get to England. What did he become?

Answer: Pig

3 In class, the teacher randomly checked and memorized the text, and the piglets, puppies, and kittens all raised their hands. Who will the teacher call?

Answer: Puppy, because Wangwang Senbei

4 Butterfly, ant, spider, centipede, they work together, which one does not get paid in the end ?

Answer: Centipede, no reward for no merit

5 The elephant in the zoo has the longest trunk, so who is the second longest?

Answer: Baby elephant

6 Which fruit has the worst eyesight?

Answer: Mango

7 Which two vegetables have mobile phones?

Answer: Carrots and greens, each has its own love

8 A turtle walked across a pile of poop, but only left three footprints on it. Why?

Answer: There is a foot holding the nose

9 Why do people go to bed to sleep?

Answer: The bed does not come by itself

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10 It turns out that there were actually 800 Spartan warriors. Why did it become 300 in the movie?

Answer: Wu Bai went to sing

11 Why can Xiaoqiang stop the car with one hand?

Answer: Taxi

12 If there is a car, the driver is a prince and the passenger is a princess, whose car does it belong to?

Answer: If

13 metal, wood, water, fire and earth, who has the longer legs?

Answer: Ham sausage

1 Who in the world gets old all of a sudden?

Answer: Bride. Because today she is the bride and tomorrow she will be the wife.

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2 How much is a heart worth?

Answer: 100 million. Because you are single-minded!

3 How much money should you bring with you to go out in typhoon weather?

Answer: 40 million. Because of the typhoon weather, don’t go out unless you have something to do.

4 It’s time to take an exam, what books can’t you read?

Answer: Encyclopedia ( Encyclopedia loses all).

5 If the end of the world is tomorrow, why do some people want to commit suicide today?

[Answer] Go to heaven and get a place

6 Question: What are you afraid of cloth and paper?

Answer: Cloth is afraid of ten thousand, paper is afraid of nothing.

Reason: Don’t be afraid of ten thousand (cloth), just be afraid of something unexpected (paper).

7 Question: What is the last name of Pencil?

Answer: Xiao

Reason: Sharpen (Xiao) pencil.

8 Question: What will the unicorn become when it reaches the North Pole?

Answer: ice cream.

Reason: Ice cream (Ice Kirin).

9 Question: Which number from 1 to 9 is the most diligent and which number is the laziest?

Answer: 1 Lazy; 2 Hardworking

Reasons: One (1) does not do it and two (2) does not stop.

10 Question: How to make a sparrow quiet?

Answer: Press it.

Reason: silence.

11 Question: Who is the fastest runner in history?

Answer: Cao Cao

Reason: It is said that Cao Cao arrived

12 Question: Which number from 30 to 50 is more powerful than a bear’s poop!

Answer: 40

Reason: Facts speak louder than a bear’s argument

13 Question: What should I do if the pigs escape from the pigsty?

Answer: Wang Leehom

Reason: Coaxing inward

14 Question: What should I do if it comes out again?

Answer: Han Hong

Reason: Still coaxing

15 September 28 is the birthday of Confucius, so what day is October 28?

Answer: Confucius Full Moon

16 The wolf is coming (guess the fruit)?

Answer: Star Tao (Sheep Flee)

17 What would the world be like if Jiang Gong (Chiang Kai-shek) was still alive?

Answer: One more person...

18 Are there carps (four-character idiom) under these two pieces of ice?

Answer: Polite (Bingbing) (There are carps)

19 Why can tofu hurt people?

Answer: Because it is frozen tofu

20 There was an accident on a bus, and everyone was He was injured, but why was Xiao Ming okay?

Answer: Because he is not in the car

21 There is a place that can be entered or exited. What is this place?

Answer: Grave

22 In the 100-meter race between chicken and goose, the chicken runs faster than the goose. Why does it arrive at the finish line later?

Answer: The chicken ran in the wrong direction

23 The class bell rang in the east , but no classmates are in the classroom. What's going on?

Answer: She is in physical education class

24 Lingling has never studied arithmetic, but the teacher praises her as one of the best in mathematics. Why?

Answer: From Count to two

25 When Columbus stepped into the New World with one foot, what did he do next?

Answer: Step with the other foot

26 Someone It is said that eating fish can prevent myopia. Why?

Answer: Have you ever seen a cat wearing eyes

27 What has no tongue in its mouth

Answer: A teapot spout

28 What does it look like? The official can't give orders, but he has to laugh at others all the time?

Answer: Xinlangguan

29 A policeman ran away when he saw a thief. Why?

Answer: I want to catch the thief quickly

30 Xiaoming eats chewing gum every day, but others still say he has bad breath. Why?

Answer: He swears every day.

31 Why can frogs jump higher than trees?

Answer: Because trees cannot jump

32 "You stand with a pig", guess an animal

Answer: Elephant (like)

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33 Lao Wang shaves forty or fifty times a day, but he still has a beard on his face. What is the reason?

Answer: Lao Wang is a barber

34 What flowers cannot be touched

Answer: Sparks

35 What can be used to unlock all the flowers? The mystery?

Answer: Answer

3 6 When will the clock in Times Square ring 13 times?

Answer: It’s time to repair

37 In ancient times, who became a father-in-law before becoming a father?

Answer: Eunuch

38 When someone knocks on the door, you would never say please come in?

Answer: When going to the toilet

39 Is black chicken more powerful or white chicken? Why?

Answer: Black chicken is more powerful and can lay white eggs. Chickens cannot lay black eggs.

40 Why do everyone like to sit and watch movies?

Answer: Because standing and watching will make your feet sore

41 What will be the impact of abolishing morning self-study?

Answer: Sleep less for half an hour

42 Let the tortoise and the hare race, and let the pig be the referee. Who will win?

Answer: Can’t say! The person who said it was a pig...

43 What is the similarity between what two women said and what a thousand ducks said?

Answer: Nonsense (chicken) talk

44 The farmer has a pig and a donkey at home. During the Chinese New Year, do you think the farmer should kill the pig or the donkey first?

Answer: Would you rather kill a pig (silly pig) or a donkey (silly donkey)?

45 Why doesn’t the plane hit the stars when it flies so high?

Answer: Because the stars will "flash"

46 One day, he was walking on the street with a medium-rare steak. Suddenly he saw a medium-rare steak in front of him. But he ignored him.

Why didn't they say hello?

Answer: Because they are not familiar with it

1 Who is the King of Beasts? ●Zoo Director

2 What kind of person will appear after death? ●People in the movie

3 What kind of hat cannot be worn?●Nut hat

4 What kind of book can’t be bought in the bookstore?●Suicide note

5 Elephant’s What does the left ear look like? ●Right ear

6 What water can never be used up?●Tears

7 What has five heads, but people don’t think it is strange?●Hands and feet

8 The family members asked the doctor about the patient’s condition. The doctor only raised 5 fingers, and the family members cried. What was the reason? ●Three longs and two shorts

9 Put a chicken and a goose at the same time On the iceberg, why did the chicken die but not the goose? ●The goose is the penguin

10 Which English letters do people like to listen to and are listened to by the most people?●CD

11 What is the secret of human longevity? ●Keep breathing, don’t stop breathing

12 The angrier something gets, the bigger it becomes? ●Temperature

13 What is the flower that blooms all year round? ●Plastic flower

14 Why does Chang'e like to live on the moon? ●Chang moth likes to eat rabbit meat

15 Where is the narrowest road? ●Enemies meet in a narrow road

16 What is the name of farting before death? ●Absolute sound

17 When does someone knock on the door and you never say please come in? ●In the toilet

18 What is the smallest island in the world? ●Safety island on the road

19 When the earth explodes, which place is the safest? ●Hell

20 A group of henpecked men are gathering together to discuss how to restore the glory of manhood. Suddenly they heard that their wives were coming. Everyone ran away except one person. Why? ●I fainted from fear

21 What is in the middle of the Pacific Ocean? ●It is the character "平"

22 What character is used all over the world? ●Arabic numerals

23 A child and an adult are walking in the dark night. The child is the adult’s son, but the adult is not the child’s father. Why? ●Because they have a mother-son relationship

24 Two pairs of father and son went to buy hats. Why did they only buy three hats? ●Grandpa, father and son

25 Why can’t eggs be broken with a hammer? ●Of course the hammer won't break

26 A man was being chased by a tiger. Suddenly there was a big river in front of him. He couldn't swim, but he passed by. Why? ●Fainted

27 The world boxing champion is easily knocked down by what? ●Sleepy

28 There is a four-character idiom about a lady who has been divorced several times? ●The ex-husband (gong) has exhausted his energy (abandoned)

29 What is the worst thing for a person who stutters? ●Making long-distance calls

30 What did Columbus do next after he stepped into the New World? ●Step on the other foot

31 Is "Kiss" a verb, adjective or noun? ●Conjunction

32 After the heart transplant operation failed, the doctor asked the patient who was about to expire what he wanted to say. Tell me, what do you think he will say? ●Actually, you don’t understand my heart

33 Why do men have to fistfight when they drink together? ●You will be fined if you don’t eat the toast

34 If 8 is divided into two halves, what is the number? ●0

35 When will the sun rise from the west? ●When swearing

36 There is a newborn baby. There are two children born in the same year, the same month and the same day as him, and they were born to the same parents, but they are not twins. Is this possible? ●Maybe, they are triplets

37 What is the first thing everyone should do when they wake up in the morning? ●Open your eyes

38 A new hospital has opened in the city, with advanced equipment and considerate services.

But the strange thing is: not a single patient is admitted here. Why is this? ● This is a veterinary hospital

39 In winter, how can we turn ice into water immediately without heating? ●Remove two points from the ice

40 A hungry cat walked past a fat mouse. Why did the hungry old cat remain indifferent and continue walking on its path without even looking at this? A mouse?●A blind cat encounters a dead mouse

41 Why does the peacock fly to the southeast instead of the northwest? ●Because there is a high wall in the northwest

42 A truck driver and a motorcyclist collided. The truck driver was seriously injured, but the motorcyclist was fine. Why? ●The truck driver was not driving at the time

43 Xiao Ming’s mother has three sons. The eldest only son is called Da Ming, and the second son is called Er Ming. What is the name of the third son? ●Of course my name is Xiao Ming

44 There was a young man who wanted to cross a river to do something; however, there was no boat or bridge in this river. So he swam across the river in the morning, and he swam to the other side in just an hour. That afternoon, the width and flow rate of the river had not changed. More importantly, his swimming speed had not changed either, but it took him two It took half an hour to swim to the other side of the river. Why do you think it was? ●Two and a half hours add up to one hour

45 There was a large ship on the sea. Its original capacity was 60 people. As a result, when the 59th person was on board, it sank. Into the sea! Why is this (there are no pregnant or overweight people in the boat; there are no heavy objects on the boat)? ●Don’t be nervous, it is a submarine

46 God doesn’t know what the earth knows, you don’t know and I know ? ● The soles of the shoes are broken

47 There are two people, one facing south and one facing north. They are not allowed to look back, move around, or look in the mirror. Ask them if they can see each other’s eyes. Face? ●Of course, they are standing face to face

48 What kind of eggs cannot be beaten, cooked, and not eaten? ●The zero egg "0" obtained in the exam

49 Use coconut Which one is more painful? Watermelon or watermelon? ●My head hurts

50 What is the difference between Confucius and Mencius? ●Confucius’ son is on the left. Mencius’ disciples are above

51 What can I borrow without paying it back? ●Borrowing light

52 What is the first animal you see when you enter the zoo? ●Conductor

53 What is something that a magnifying glass cannot magnify? ●Angle

54 What will increase by half when it is turned upside down? ●6

55 You will destroy it just by calling its name. What is it? ●Silence

56 What often comes but never really comes? ●Tomorrow

57 Xiao Wang and his parents traveled abroad for the first time. Due to the language barrier, his parents seemed at a loss. Xiao Wang did not understand any foreign language. He was not deaf-mute, but he seemed to be in his own way. The country has never felt any inconvenience. Why? ●Xiao Wang is a baby

58 How can I write red letters with a blue pen? ●Write the word "red"

59 When a car turns right, which tire does not rotate? ●Spare Tire

60 There is a piece of natural black marble. What will happen if you throw it into the Qiantang River on September 7th? ●Sink to the bottom of the river

61 Under what circumstances will a person smoke from his orifices? ●Cremation

62 The vixen is best at bewitching men, so what kind of "spirit" can confuse men and women together?● Alcohol

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63 Why would a healthy couple give birth to a baby without eyes?● Chickens lay eggs

64 Why do two tigers fight to the death? ●No one dares Breaking up the fight

65 Mr. Lin received an artificial heart after major surgery. After she recovered from the illness, her girlfriend immediately broke up with her. Why did this happen? ●I didn’t really love her

66 You can do it, I can do it, everyone can do it; one person can do it, two people can do it Can't do it together.

What is this doing? ●Dreaming

67 Are black chickens or white chickens more powerful? Why? ●Black chickens, black chickens will lay white eggs, white chickens will not lay black eggs

68 Return in the middle of the night You realize you forgot to bring your key and no one else is at home. What is your biggest wish? ● The door is forgotten

69 What are the benefits of black hair? ●Not afraid of tanning

70 If tomorrow is the end of the world, why do some people want to commit suicide today? ●Go to heaven and get a seat

71 The manager can’t cook, but there is one dish that he is particularly good at. What is it? ●Fired

72 What kind of wine should not be drunk? ●Iodine

73 Why is a bottle of medicine labeled highly toxic but harmless to people? ●As long as you don’t drink it

74 What can you hit without any effort? ●Doze off

75 There is something that people who buy it know, people who sell it also know it, but only people who use it don’t know, what is it? ●Coffin

76 Some people say that a woman is like a book, so what kind of book does a fat woman look like? ●Bound volume

77 What is the difference between being bitten by a crocodile and being bitten by a shark? ●No one knows

78 A cow walks 10 meters north, then 10 meters west, then 10 meters south, then backs up and turns right. Where is the cow's tail facing? ●Chao Di

79 "Innate" refers to the inheritance of parents, so what is "nurture"? ●The day after tomorrow

80 What are the main causes of divorce? ●Marriage

81 How to divide 9 oranges fairly among 13 children? ●Squeeze them into juice

82 Place a pencil on the ground so that no one can cross it But, how to do it? ●Put it against the wall

83 Why does the Statue of Liberty always stand in New York Harbor? ●She can’t sit

84 Why can frogs jump higher than trees? ●Trees don’t jump

85 Is there anything in the world that can carry people at a speed of nearly 2,000 kilometers per hour without refueling or other fuel? ●Earth

86 For fear of losing shape, what do you call a beautiful woman who doesn’t have children after getting married? ●Peerless beauty

87 Why do black people like to eat white chocolate? ●Afraid of eating one's own fingers

88 Who never dares to take a bath● Clay figurine

89 Why are most Buddhists in the Northern Hemisphere? ●Nan "Wu" Amitabha

90 What is not illegal to steal?●Smirk

91 Do you know where modern scientists are generally born? ●In the hospital

92 Why do the wild geese fly south? ●Because walking is too slow with feet

93 You can eat winter melon, cucumber, watermelon, and pumpkin, but what kind of melon can’t be eaten? ●Fool

94 There are 6 steamed buns in the basin. Each of the 6 children is assigned 1 steamed bun, but there is still 1 steamed bun left in the basin. Why? ●The last child took the basin away with him

95 Lao Wang shaved forty or fifty times a day, but he still had a beard on his face. What is the reason? ●Lao Wang is a barber

96 There is a word that everyone will mispronounce when they see it. What is this word? ●This is the wrong word

97 What kind of car is difficult to move? ●Windmill