SOLUTION: How much 12% acid must be added to 16 gallons of pure water to get a mixture that is 7% acid?

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Question 749841: How much 12% acid must be added to 16 gallons of pure water to get a mixture that is 7% acid?
Answer by josgarithmetic(39617) About Me  (Show Source):
You can put this solution on YOUR website!
(amount of pure acid)/(amount of mixture)=(concentration of acid)

let g = gallons of the 12% acid to use.

12*g would represent amount of acid, although 100 times larger
g+16 would be total gallons of mixture

12%2Ag%2F%28g%2B16%29=7
Solve for g.