SOLUTION: How many cups of pure water should be mixed with 8.5 cups of a 90% acid solution to dilute it into a 4% acid solution?

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Question 717516: How many cups of pure water should be mixed with 8.5 cups of a 90% acid solution to dilute it into a 4% acid solution?
Answer by nshah11(47) About Me  (Show Source):
You can put this solution on YOUR website!
(8.5(0.9))/(8.5 + x) = 1/25
191.25 = 8.5 + x => x = 182.75 cups