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OpenStudy (anonymous):
There are 15 books on a shelf. of these books 7 are new. (a) What is the ratio of used books to new books? (b) What is the ratio of used books to all books?
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OpenStudy (anonymous):
a) 8:7 b) 8:15
OpenStudy (anonymous):
To get the number of used books. You have to find the number of books left on the shelf. So: \[15-7=?\]
OpenStudy (anonymous):
used books:new books = 15 already know new books = 7 therefore 15-7=8 thus ratio = 8:7
OpenStudy (anonymous):
the ratio of used books:all books = 8:15
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