SOLUTION: How much water should be added to 1 gallon of pure antifreeze to obtain a solution that is 60% antifreeze?

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Question 220427: How much water should be added to 1 gallon of pure antifreeze to obtain a solution that is 60% antifreeze?
Answer by Alan3354(69443) About Me  (Show Source):
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How much water should be added to 1 gallon of pure antifreeze to obtain a solution that is 60% antifreeze?
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The original 1 gallon of a/f will be 60% of the solution, s.
1 gallon = 60% = 0.6s
s = 1/0.6 = 5/3 gallons
Add 2/3 gallons.