Remark
Set up a proportion for this problem. Solve the proportion.
Givens
3 cups make 4 waffles.
Solve
How many cups does it take to make 12 waffles.
Proportion
3 cups:4 waffles :: x: 12 waffles.
Solve
3/4 = x / 12 Cross multiply
3*12 = 4*x Multiply the factors on the left.
36 = 4x Divide by 4
36/4 = x
9 = x
Answer
9 cups of flour are needed for 12 waffles <<<< Answer
