SOLUTION: How much 20% acid solution, must be added to 10 gallons 8% acid solution to end up with a 15% acid solution?

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Question 356354: How much 20% acid solution, must be added to 10 gallons 8% acid solution to end up with a 15% acid solution?
Answer by Fombitz(32388) About Me  (Show Source):
You can put this solution on YOUR website!
Let A be the amount of 20% solution added.
20A%2B8%2810%29=15%28A%2B10%29
20A%2B80=15A%2B150
5A=70
highlight%28A=14%29gallons