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Bookshelves in the school library. (1) How many books are there in this bookshelf? (2) A school has 23 such bookshelves. How many books are there?
(1) A * * * has 6 layers, with an average of about 70 copies per layer.

70×6=420 (Ben),

There are about 420 books on this shelf.

(2)420×23=9660 (Ben),

A: There are about 9,660 books on 23 shelves.

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