Question

For a given recipe, 9 cups of flour are mixed with 18 cups of sugar. How many cups of sugar should be used if 15 cups of flour are used?

Answer 1

7.5 cups of sugar

Explanation:

You should use proportions to find the answer.

9/18 = 15/x

Cross multiply:

9*15 = 135

135/18 = 7.5

Because half of 18 is 9, you just need to find half of 15, which is 7.5.