Etch Clean Graphics uses one cleanser that is 25% acid solution and a second that is 50% acid. How many liters of each should be mixed to get 30 liters of a solution that is 40% acid?
Let x = liters of 25%, and y = liters of 50%, then
A: x + y = 30
B: .25x + .50y = .40 • 30 = 12
(B • 4): x + 2y = 48
(B • 4 - A): y = 18
∴ x = 12
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Let x = liters of 25%, and y = liters of 50%, then
A: x + y = 30
B: .25x + .50y = .40 • 30 = 12
(B • 4): x + 2y = 48
(B • 4 - A): y = 18
∴ x = 12