The school library has storybooks and cartoon picture books, there are 72 more storybooks than cartoon picture books, and the storybooks are three times as many as the cartoon picture books, how many

The school library has storybooks and cartoon picture books, there are 72 more storybooks than cartoon picture books, and the storybooks are three times as many as the cartoon picture books, how many storybooks are there? This is a typical difference and multiplication problem in elementary school Olympiad.

Solution: cartoon book 72 ÷ (3-1) = 36 (books)

story book 36 + 72 = 108 (books)

Thinking: difference ÷ (times - 1) = small number

small number + difference = large number

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