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Galvin bought 3/5 as many non-fiction books as fiction books from a book fair. He read 6 non-fiction books and 13 fiction books. He then had 3/4 as many non-fiction books left read as fiction books. How many books did Galvin buy altogether?

 Aug 26, 2021
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Lets say Galvin has x books left to read for fiction books. (X + 13) + (3x/4 + 6) = all books bought

 

(x+13)=5(3x/4 + 6)/3

3x+39=15x/4+30

3x/4=9

x=12

 

12+13+9+6=$\boxed{40}$

 Aug 26, 2021

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