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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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alexshen03
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choixongdong
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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