Bill has some books. They’re all fiction books, biographies or history books. 3/14 of the books and 1/6 are history books. What fraction of Bill’s books are fiction books?

Answer 1

3/14 + 1/6 = 18/84 + 14/84 = 32/84 = 16/42 = 8/21

1 - 8/21 = 21/21 - 8/21 = 13/21 are fiction