SOLUTION: How many quarts of pure antifreeze must be added to 4 quarts of a 20% antifreeze solution to obtain a 30% anitfreeze solution

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Question 209338: How many quarts of pure antifreeze must be added to 4 quarts of a 20% antifreeze solution to obtain a 30% anitfreeze solution
Answer by rfer(16322) About Me  (Show Source):
You can put this solution on YOUR website!
1.00x+.2(4-x)=4*.3
x+.8-.2x=1.2
.8x=.4
x=.5 qts of 100%