Question

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

If x represents 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?
(Points : 1)
1.92 + 0.32x = 0.4(x + 12)
3.84 + 0.4x = 0.16(x + 12)
4.8 + 0.32x = 0.4(x + 12)
1.92 + 0.4x = 0.32(x + 12)