SOLUTION: How much water must be added to 20 gallons of a solution that is 30% alcohol to dilute it to a solution that is only 25% alcohol?

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Question 929054: How much water must be added to 20 gallons of a solution that is 30% alcohol to dilute it to a solution that is only 25% alcohol?
Answer by ewatrrr(24785) About Me  (Show Source):
You can put this solution on YOUR website!
water = water
x the water added
x + .70(20G) = .75(20G + x)
x = .05(20G)/.25 = 4G, the amount of water to add