SOLUTION: How many gallons of a 2% salt solution must be mixed with 40 gallons of a 8% solution to obtain a 6% solution?

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Question 349128: How many gallons of a 2% salt solution must be mixed with 40 gallons of a 8% solution to obtain a 6% solution?
Answer by Fombitz(32388) About Me  (Show Source):
You can put this solution on YOUR website!
Let A be the amount of 2% solution.
2A%2B8%2840%29=6%28A%2B40%29
2A%2B320=6A%2B240
4A=80
highlight%28A=20%29gallons