Mathematics, 09.06.2021 19:30 mirza326

There are 13 books on a shelf. Of these books are new. 9 The rest of them are used. (a) What is the ratio of used books to new books? (b) What is the ratio of all books on the shelf to used books?

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There are 13 books on a shelf. Of these books are new. 9 The rest of them are used. (a) What is the...