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15 August, 00:55

There are 13 books on a shelf. 6 of these books are new. (a) What is the ratio of new books to used books? (b) What is the ratio of all books to used books?

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  1. 15 August, 01:20
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    6 of 13 are new right? so that must mean 7 are used
  2. 15 August, 01:24
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    If 6 of the 13 books are new, then 7 of them are used. The ratio of new (6) to used (7) is

    6:7 or 6/7

    Ratio of all books (13) to used books (7) is

    13:7 or 13/7
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