SOLUTION: How many cups are pure water should be mixed with 8.5 cup of an 80% acid solution to dilute it into a 2% acid solution

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Question 989357: How many cups are pure water should be mixed with 8.5 cup of an 80% acid solution to dilute it into a 2% acid solution
Answer by josgarithmetic(39617) About Me  (Show Source):
You can put this solution on YOUR website!
Same amount of pure acid; different concentration because the water alone does not have any acid.

%288.5%2A80%29%2F%288.5%2Bx%29=2