I'm not sure how to solve this problem using unit rate.
Jonathan is baking several boxes of bread. He used 9cups of water to 12 cups of flour. How much water was used per cup of flour?
9cups water/12cups flour = 3/4 cups water
--is the problem solved by acutally dividing 9 by 12 or solve by simplfying fraction of 9/12 (using 3 as common factor)?