a cookie recipe calls for 3 and 1/4 cup of flour the recipe makes three dozen cookies how much flour is needed to make 144 cookies
144 = 12 dozen, so
4 * 3 1/4 = 13 cups
1 dozen=12
3 dozens=??
=3×12
=36 cookies
36 cookies=13/4 cups
144 cookies=??
=144/36×13/4
=13 cups