There are 17 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 all books to used books?
(1) Answers
a.) 9 new : 8 used b.) 17 all : 8 used
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a.) 9 new : 8 used b.) 17 all : 8 used