Elena’s bread recipe calls for 2 ounces of butter for each 5 cups of flour used. She needs to make 4 times the original recipe. If 12 ounces of butter is used, then how many cups of flour are needed? Pick:
A) 1  B) 4  C) 9  D) 13  E) 20
Solving through algebra route:   2B + 5F = x amount   If we multiply this equation with 4 we get:   8B + 20F =4X   Therefore, we got 8 ounces of butter and 4X amount of quantity when we use 20 ounces of floor.   Ans:20
<result>E</result>
Elena’s bread recipe calls for 2 ounces of butter for each 5 cups of flour used. She needs to make 4 times the original recipe. If 12 ounces of butter is used, then how many cups of flour are needed?