Percentage Help

Question

How many liters of a 35% acid solution and a 70% acid solution must be used to produce 70 liters of a 60% acid solution?

Answer 1

T+S = 70

35T+70S = 60(70)

T + 2S = 120

70-S + 2S = 120

S = 50 liters of seventy solution

T = 20 liters of thirty five solution