+56 In the class library, 3/5 of the books are fiction books. 2/3 of the remaining books are non-fiction books. The rest are magazines. There are 10 fewer magazines than non-fiction books in the class library. How many fiction books are there altogether?
+1693 In the class library, 3/5 of the books are fiction books. 2/3 of the remaining books are non-fiction books. The rest are magazines. There are 10 fewer magazines than non-fiction books in the class library. How many fiction books are there altogether?
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
x => all books and magazines
3x/5 => fiction books
2/3(x - 3x/5) => non fiction books
2/3(x - 3x/5) - 10 => magazines
I'm sure you can find your answer. 
