Question

A recipe for oatmeal cookies calls for 5 cups of flour for every 8 cups of oatmeal. How much flour is needed for a big batch of cookies that used 16 cups of oatmeal?

Answer 1

10 cups

Explanation:

Since 16 cups is twice 8 cups, it needs twice 5 cups of flour which is 10 cups.

We can also use a proportion.

5/8 = x/16

8x = 5 × 16

x = 5 × 2

x = 10

Answer: 10 cups