SOLUTION: How many gallons of pure water must be added to 10 gallons of 30% salt water to make a solution that is 25 % salt water?

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Question 375194: How many gallons of pure water must be added to 10 gallons of 30% salt water to make a solution that is 25 % salt water?
Answer by Fombitz(32388) About Me  (Show Source):
You can put this solution on YOUR website!
Water is a 0% solution.
Let A be the amount of water added.
0A%2B30%2810%29=25%28A%2B10%29
300=25A%2B250
25A=50
highlight%28A=2%29gallons