Question

The library at school is organized by fiction and nonfiction books. There are three nonfiction books for every seven fiction books. How many total books are there if the library has 240 nonfiction books

Answer 1

Ratio- 3:7

240/3= 80
80x7=560

Answer 2

3/7 = 240/x....3 non-fiction to 7 fiction = 240 non fiction to x fiction
cross multiply
(3)(x) = (240)(7)
3x = 1680
x = 1680/3
x = 560

so we have 240 non-fiction books and 560 fiction books...for a total of
(240 + 560) = 800 books <==