Question

A recipe requires 1/3 cup of milk for each 1/4 cup of water. How many cups of water are needed for each cup of milk

Answer 1

(1/3) / (1/4) = 1/x.....1/3 milk to 1/4 water = 1 milk to x water
cross multiply
(1/3)(x) = (1/4)(1)
1/3x = 1/4 ...multiply both sides by 3, eliminating the 1/3 on the left side
x = 1/4 * 3 
x = 3/4 <=== 3/4 cups of water are needed for 1 cup of milk