Question

1/3 cup of flour is used in 5 dinner rolls. How many cups of flour are needed to make 3 dozen rolls?

Answer 1

5 = 1/3 cup flour

3 dozen = 36 rolls

12 x 3 = 36

1/3 x 36 = 12

Answer 2

3 dozen=3·12=36

$\frac{1/3}{5} =\frac{x}{36}$

Use cross multiplication

1/3·36=5x

12=5x

12/5=5x/5

x=12/5 or 2 2/5 or 2.4

12/5 or 2 2/5 cups of flour is needed to make 3 dozen rolls