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3 February, 09:12

There are 15 books on a shelf. 9 of these books are new. (a) What is the ratio of new books to used books? (b) What is the ratio of used books to all books?

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  1. 3 February, 12:16
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    There are 15 books on a shelf. 9 of these books are new

    so used books = 15 - 9 = 6

    (a) What is the ratio of new books to used books

    = 9:6

    = 3:2

    (b) What is the ratio of used books to all books?

    = 6:15

    = 2:5
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