SOLUTION: How many ounces of pure water must be added to 75 oz of a 20% salt solution to make a salt solution that is 15% salt?

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Question 352699: How many ounces of pure water must be added to 75 oz of a 20% salt solution to make a salt solution that is 15% salt?
Answer by Fombitz(32388) About Me  (Show Source):
You can put this solution on YOUR website!
Pure water is a 0% salt solution.
Let A be the amount of pure water.
0%28A%29%2B20%2875%29=15%28A%2B75%29
1500=15A%2B1125
highlight%28A=25%29oz.