SOLUTION: How many cups of pure water should be mixed with 9.5 cups of a 70% acid soulution to dilute it into a 5% acid soulution?

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Question 1166772: How many cups of pure water should be mixed with 9.5 cups of a 70% acid soulution to dilute it into a 5% acid soulution?
Answer by josgarithmetic(39617) About Me  (Show Source):
You can put this solution on YOUR website!
The pure water contains no acid.

%280.7%2A9.5%29%2F%28x%2B9.5%29=0.05
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