The Fuwa of the Beijing Olympic Games include a set of trumpet in 38 yuan and a set of tuba in 96 yuan. Xiao Ming brought 600 yuan.

38M+96N=600+ 128

96M+38N=600+ 12

Simultaneous equations M = 4, n = 6.

Want to buy as many large sizes as possible, buy 6 sets of large sizes, not small sizes.

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