There are 3 non-fiction books for every 7 fiction books.  How many total books are the if the library has 240 non-fiction books?
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If total books is N, then 3N/(3+7)=240,

3N/10=240,

3N=2400,

N=800 books in total.

(240+560=800, 240/560=3/7)

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