SOLUTION: how many quarts of pure antifreeze must be added to 6 quarts of a 20% antifreeze solution to obtain a 50% antifreeze solution?

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Question 455518: how many quarts of pure antifreeze must be added to 6 quarts of a 20% antifreeze solution to obtain a 50% antifreeze solution?
Answer by jorel1380(3719) About Me  (Show Source):
You can put this solution on YOUR website!
6(.20)+m=.5(6+m)
1.2+m=3+.5m
.5m=1.8
m=1.8/.5=3.6
3.6 qts. of pure antifreeze must be added to the solution.
1.2+3.6=.5(6+3.6)
4.8=4.8