A recipe for a batch of 3 dozen chocolate chip cookies calls for 3 1/2 cups of flour, 1 cup of sugar, and 2 3/4 cups of chocolate chips. How much of each ingredient should be used to make 2 dozen cookies?

3 doz = 36 cookies, 2 doz = 24 cookies

36/3.5 = 24/x

36x = 84

x = 84/36

x = 2.33 = 2 1/3 ... so for 2 doz, u need 2 1/3 cups flour

36/1 = 24/x

36x = 24

x = 24/36

x =.666 = 3/5 ... and 3/5 cup of sugar

36/2.75 = 24/x

36x = 66

x = 66/36

x = 1.83 cups of chocolate chips