SOLUTION: How many gallons of 30% salt solution must be added to 5 gallons of a 10% salt solution to yield a solution that is 17.5% salt?

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Question 352184: How many gallons of 30% salt solution must be added to 5 gallons of a 10% salt solution to yield a solution that is 17.5% salt?
Answer by Fombitz(32388) About Me  (Show Source):
You can put this solution on YOUR website!

Let A be the amount of 30% solution.
30A%2B10%285%29=17.5%28A%2B5%29
30A%2B50=17.5A%2B87.5
12.5A=37.5
highlight%28A=3%29gallons