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There are 15 books on a self. 9 of these books are new. what is the ratio of used books to new books?
what is the ratio of all books to used books?

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There are 15 books on a self. 9 of these books are new. what is the ratio of used books to new books...

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There are 15 books on a self. 9 of these books are new. what is the ratio of used books to new books? what is the ratio of all books to used books?

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Another question on Mathematics

There are 15 books on a self. 9 of these books are new. what is the ratio of used books to new books?
what is the ratio of all books to used books?