SOLUTION: How much 12% acid must be added to 2 gallons of pure water to get a mixture that is 7% acid.

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Question 1037332: How much 12% acid must be added to 2 gallons of pure water to get a mixture that is 7% acid.
Answer by Alan3354(69443) About Me  (Show Source):
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How much 12% acid must be added to 2 gallons of pure water to get a mixture that is 7% acid.
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Add A gallons.
A*12 + 2*0 = (A + 2)*7