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Buy five yuan and three yuan books, a total of ten books, and go to 42 yuan to buy five yuan and three yuan books.
Suppose all the books are from 3 yuan:

10×3=30 (yuan)

42-30= 12 (yuan)

5-3=2 (yuan)

5 yuan's book: 12÷2=6 (Ben)

3 yuan's book: 10-6=4 (Ben)

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