You can use a proportion to solve this problem. Once you findthe amount of sugar necessary for 10 cookies, simply multiplyby 2 to find the amount necessary for 20 cookies.
Notice that it takes 35 grams of sugar to create10 cookies. Divide 35 by 10 to get the unit rate.
Unit rate: 3.5 grams of sugar per cookie
Proportions, again, will be very useful. A sample proportion is provided below.
x = 7
Complete the table in the eTool below to solve the problem.
Click the link at right for the full version of the eTool: AC 2-106 HW eTool