A cardboard box holds 40 books or 60 magazines. A wood crate holds 144 magazines. How many books can a wood crate hold if the ratio between books and magazines is the same as for the cardboard box?
40/60 = x/144
40 * 144 = 60x
40*144/60 = x Divide out 10/10
4 * 144/6 = x Divide out 2/2
2*144/3 = x Divide out 3/3
2*48 = x
96 = x
it holds 96 books