SOLUTION: How many quarts of water must be added to 5 quarts of an 80% antifreeze solution to make a 50% antifreeze solution?

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Question 343839: How many quarts of water must be added to 5 quarts of an 80% antifreeze solution to make a 50% antifreeze solution?
Answer by Fombitz(13828) About Me  (Show Source):
You can put this solution on YOUR website!
Water is a 0% solution.
Let A be the number of quarts of water.
0%28A%29%2B80%285%29=50%28A%2B5%29
400=50A%2B250
50A=150
highlight%28A=3%29