Elena’s bread recipe calls for 5 ounces of butter for each 7 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?
Choose the correct answer: A) 1 B) 4 C) 9 D) 13 E) 28
Solving through algebra route:   5B + 7F = x amount   If we multiply this equation with 4 we get:   20B + 28F =4X   Therefore, we got 20 ounces of butter and 4X amount of quantity when we use 28 ounces of floor.   Ans:28
<result>E</result>
Elena’s bread recipe calls for 5 ounces of butter for each 7 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?