SOLUTION: How much pure acid should be mixed with 6 gallons of a 20% acid solution in order to get a 40% acid solution?

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Question 367659: How much pure acid should be mixed with 6 gallons of a 20% acid solution in order to get a 40% acid solution?
Answer by Fombitz(32388) About Me  (Show Source):
You can put this solution on YOUR website!
Let A be the amount of 100% acid.
100A%2B20%286%29=40%28A%2B6%29
100A%2B120=40A%2B240
60A=120
highlight%28A=2%29 gallons