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The school library has a batch of books, and bought 360 books after lending 40%. The number of books at this time is 3: 4. How many books are there?
Solution: Suppose there used to be X books, and now there are 3/4X books.

X-40% X+360 = 3/4 times.

0.6X+360=0.75X

0.75X-0.6X=360

0. 15X = 360

X=2400

A: There are 2,400 original books.

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