Two liters of a 30% acid solution are mixed with three liters of a 20% acid solution and five liters of a 10% acid. What percent of the mixture is acid?
2 (.30) + 3 (.20 ) + 5 ( .10) 1.7
________________________ = _____ = .2125 = 21.25%
2 + 3 + 5 8
