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How to use the pot in the library?
Solution: Popular science books and comics account for 1-3/5=2/5 of the total number of these books.

Comics account for 2/5 ÷ (1-1/5+1) = 2/9.

Comics account for 3/5-2/9 of the total number of books =17/45.

There are 170÷ 17/45=450 books repurchased.

A: There are 450 books repurchased.

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