SOLUTION: How many cups of pure juice must be added to 40 cups of punch that is 5% juice to obtain punch that is 10% juice

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Question 750576: How many cups of pure juice must be added to 40 cups of punch that is 5% juice to obtain punch that is 10% juice
Answer by josgarithmetic(39617) About Me  (Show Source):
You can put this solution on YOUR website!
c = how many cups of juice, which is 100%.
%2840%2A5%2Bc%2A100%29%2F%2840%2Bc%29=10
That was most of the solution. The rest is solve the equation for c.