Two hundred liters of a 75% acid solution is obtained by mixing a 90% solution with a 50% solution. How many liters of each?
+36916 200 liters of 75% = .75 (200) = 150 gallons of acid
.90 x + .50(200-x) = 150
.9x + 100 - .5x = 150
.4x = 50
x = 90% solution = 125 gallons
200-x = 50% solution = 200-125 = 75 gallons of 50% solution
