SOLUTION: how many gallons of pure water should be added to 10 gallons of a solution that is 25% soap to make the solution 5% soap?

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Question 451267: how many gallons of pure water should be added to 10 gallons of a solution that is 25% soap to make the solution 5% soap?
Answer by jorel1380(3719) About Me  (Show Source):
You can put this solution on YOUR website!
10 x .25=2.5
2.5/.05=50
50-10=40
You must add 40 gallons of pure water to make a 5% soap solution