SOLUTION: How many gallons of distilled water must be mixed with 75 gallons of 30% alcohol solution to obtain a 25% solution?

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Question 163127: How many gallons of distilled water must be mixed with 75 gallons of 30% alcohol solution to obtain a 25% solution?
Answer by Fombitz(32388) About Me  (Show Source):
You can put this solution on YOUR website!
Write the concentration equation.
G%2A0.00%2B75%2A0.30=%28G%2B75%29%2A0.25
75%2A30=%28G%2B75%29%2A25
2250=25G%2B1875
25G=375
G=15
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15 gallons of distilled water will bring it to 25% solution.