A recipe use 2.5 cups of flour to make 2 dozen cookies.If pamela wants to make 72 cookies, how many cups of flour will she use? Show your work!
2.5 cups makes 24 cookies {2 dozen}
72 is three times as many.
So 3 x 2.5 = 7.5 cups to make 72.
Mathematically, we have
2.5 / 24 = x / 72 cross-multiply
180 = 24x divide both sides by 24
x = 7.5
+153 
