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Children's book statistics
Solution: Reference book: 288÷45%×25%= 160.

Science and technology books: 288÷45%×30%= 192.

(1) How many books are there in the corner?

288/45% = 640 copies

② Find out the difference between the two books.

How many science and technology books are there than reference books?

192- 160=32 copies.

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