SOLUTION: How much water should be added to 1 gallon of pure antifreeze to obtain a solution that is 65% antifreeze?

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Question 339854: How much water should be added to 1 gallon of pure antifreeze to obtain a solution that is 65% antifreeze?
Answer by Fombitz(32388) About Me  (Show Source):
You can put this solution on YOUR website!
Water is 0% antifreeze solution.
Let A be the amount of water added.
0%28A%29%2B100%281%29=65%28A%2B1%29
65A%2B65=100
65A=35
A=35%2F65=7%2F13 gallons