You need 1 1/4 cups of sugar to make 20 cookies. To make 12 cookies you will need cups of sugar?

0.75 or 3/4 cups

Step-by-step explanation:

Make a proportion

We need 1 1/4, or 1.25 cups of sugar for 20 cookies, and we need x cups of sugar for 12 cookies

1.25/20=x/12

To solve, we need to get the variable,x, by itself. It is being divided by 12. To reverse this, multiply both sides by 12.

12(1.25/20)=(x/12)12

The 12s on the right will cancel, and we are left with

0.75=x

0.75 is equivalent to 3/4

So, 0.75 or 3/4 cups of sugar is needed to make 12 cookies