SOLUTION: how many quarts of pure antifreeze must be added to 3 quarts of a 20% antifreeze solution to obtain a 50% antifreeze solution?

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Question 880733: how many quarts of pure antifreeze must be added to 3 quarts of a 20% antifreeze solution to obtain a 50% antifreeze solution?
Answer by josgarithmetic(39617) About Me  (Show Source):
You can put this solution on YOUR website!
The problem solution works as explained in the lesson:
Click this link to read and study the lesson. Mixture: one material quantity unknown

v is how many quarts of pure material to add.
highlight%28%2820%2A3%2B100v%29%2F%28v%2B3%29=50%29