Mathematics, 22.11.2019 23:31 volleyballfun24

There are 15 books on a shelf. 7 of these next books are new. (a) what is the ratio of used books to all books? (b) what is the ratio of used books to new books?

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There are 15 books on a shelf. 7 of these next books are new. (a) what is the ratio of used books to...