Grandma Betty's recipe makes 6 cupcakes and uses 13 of a cup of sugar. How many cups of sugar will it take to make 2 ½ dozen cupcakes?

Answer 1

I assume you meant 1/3 and not 13 cups.

2 1/2 dozen = 30 cupcakes

cupcakes/cups of sugar: 6/(1/3) = 30/x

Cross multiply.

6x = 10

x = 1 2/3 cups of sugar