Question

Amy mixes 12 liters of 16% acid solution with a 40% acid solution which results in 32% acid solution.

Let x represent the number of liters of 40% solution used. Which equation can be used to find the number of liters of 40% acid solution in the mixture?

A.1.92 + 0.32x = 0.4(x + 12)

B.3.84 + 0.4x = 0.16(x + 12)

C.4.8 + 0.32x = 0.4(x + 12)

D.1.92 + 0.4x = 0.32(x + 12)

Answer 1

The amount of acid in the 16% solution is 12 * .16 = 1.92 liters.
The amount of acid in the 40% solution is 0.4x liters.
The amount of acid in the 32% final solution is 0.32(x + 12) liters.
Using the above information, you can form one of the equations in the answer choices.