Arianna is making a cookie recipe that requires 4 cups of sugar for every 12 cups of flour. Arianna only has 9 cups of flour. She concludes that she will only need 3 cups of sugar.

I believe that her theory is correct

Step-by-step explanation:

this is because the ratio of cups of sugar to cups of flour is 1:3 and if we times both sides by 3 we get 3:9 which is the answer she presents

-22

times both sides by 2, times () by 8, add alile terms, move terms, add alike and caculate divide both sides by 3