Question 608433: How many liters of a 75% acid solution must be added to 30 liters of a 15% acid solution to produce a 50% solution. Answer by nerdybill(7384) (Show Source):
You can put this solution on YOUR website! How many liters of a 75% acid solution must be added to 30 liters of a 15% acid solution to produce a 50% solution.
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Let x = amount (liters) of 75% acid solution added
then
.75x + .15(30) = .50(30+x)
.75x + 4.5 = 15+.50x
.25x + 4.5 = 15
.25x = 10.5
x = 42 liters
