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The school divided a batch of books into nine categories.
Solution:

There is class X.

35X+ 17 = 40(X- 1)+(40-28)

35X+ 17=40X-28

5X=45

X=9

So there are 9 classes, and the number of books =35×9+ 17=332.

Answer; There are 332 books and 9 courses.

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