SOLUTION: How much water must be added to 3 gallons of a 4% insecticide solution to reduce the concentration to 3%?

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Question 262263: How much water must be added to 3 gallons of a 4% insecticide solution to reduce the concentration to 3%?
Answer by nerdybill(7384) About Me  (Show Source):
You can put this solution on YOUR website!
How much water must be added to 3 gallons of a 4% insecticide solution to reduce the concentration to 3%?
.
Let x = gallons of water to be added
then
.04(3) = .03(3+x)
.12 = .09+.03x
.03 = .03x
1 gallon = x