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There are 90 books in the library. Borrow 20 books in grade one and 17 books in grade two. How many books are there in the library?
This is a subtraction problem.

If you take 90 books out of 20 books, there are 90-20=70 books left. Then 17 books were taken away, so the remaining books were 70- 17=53. If continuous subtraction is used, 90-20- 17=53 books are obtained.

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