Two liters of a 30% acid solution are mixed with three liters of a 70% acid solution. What percent of the mixture is acid?
Final solution volume is 2 + 3 = 5 liters
.3 (2) + .7 (3) = x ( 5)
( .6 + 2.1 ) / 5 = x
2.7 / 5 = .54 or 54 %