SOLUTION: A solution of 70 pounds of acid contains 6 pounds of pure acid. How many pounds of pure acid must be added to make a solution which is 20% pure acid?

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Question 1184973: A solution of 70 pounds of acid contains 6 pounds of pure acid. How many pounds of pure acid must be added to make a solution which is 20% pure acid?
Answer by josgarithmetic(39617) About Me  (Show Source):
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A solution of 70 Seventy pounds of solution contains acid contains 6 pounds of pure acid. How many pounds of pure acid must be added to make a solution which is 20% pure acid?
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Add p pounds of the pure acid;
%281.00%2Ap%2B6%29%2F%28p%2B70%29=0.20