Ratio and Proportion

Question

A bakery uses a special flour mixture that contains corn, wheat, and rye in the ratio of 3:5:2. If a bag of the mixture contains 5 pounds of rye, how many pounds of wheat does it contain?

a)2 b)5 c)7.5 d)10 e)12.5

Answer 1

The ratio of wheat to rye is 5:2.

The amount of rye is 5 pounds.

Create a proportion.

Let x represent the amount of wheat.

Find the cross products.

Solve the equation for x.

5/2=x/5            (wheat)

5(5) = 2(x)      (cross-product )

25= 2x            ( multiply ) 

25/2=2x/2       (divide each side by 2)

12.5 = x            (simplify)

The bag contains 12.5 pounds of wheat.

The answer is e.