Question

A recipe calls for 3 cups of sugar and 9 cups of water. How many cups of water should be used with 2 cups of sugar?

Answer 1

since 3cups = 9cups ... and they are asking how much water would go in 2cups of sugar .. then the answer would be ..
6cups of water

because you cross multiply.

Answer 2

First you do 9/3
9 divided by 3 is 3
This means there is 3 cups of water for every cup of sugar
Then do 2 times 3
You would need 6 cups of water to go with 2 cups of sugar