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There are four shelves in the library, and each shelf can hold 20 books. 1000 book enough 1 1 bookshelf?
(1)20×4×3=240 (Ben);

A: There are about 240 books in three such bookshelves.

(2)550÷(20×4)

=550÷80

≈7 (pieces);

Answer: It is more appropriate to buy 550 new books and 7 such bookshelves.

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