SOLUTION: how many liters of water must be added to 70 liters of an 85% alcohol solution to reduce it to 50% alcohol solution?

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Question 1007472: how many liters of water must be added to 70 liters of an 85% alcohol solution to reduce it to 50% alcohol solution?
Answer by fractalier(6550) About Me  (Show Source):
You can put this solution on YOUR website!
Here, let x be the amount of water we are adding. The set up looks like this
70(.85) = (70+x)(.50)
59.5 = 35 + .5x
24.5 = .5x
x = 49 liters