SOLUTION: How many gallons of a 3% salt solution must be mixed with 20 gallons of a 9% solution to obtain a 5% solution?

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Question 342400: How many gallons of a 3% salt solution must be mixed with 20 gallons of a 9% solution to obtain a 5% solution?
Answer by Fombitz(32388) About Me  (Show Source):
You can put this solution on YOUR website!

Let A be the amount of 3% solution.
3A%2B9%2820%29=5%28A%2B20%29
3A%2B180=5A%2B100
2A=80
highlight%28A=40%29gallons