SOLUTION: how many quarts of pure antifreeze must be added to 4 quarts of a 20% antifreeze solution to obtain a 60% antifreeze solution?

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Question 590057: how many quarts of pure antifreeze must be added to 4 quarts of a 20% antifreeze solution to obtain a 60% antifreeze solution?
Answer by lwsshak3(11628) About Me  (Show Source):
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how many quarts of pure antifreeze must be added to 4 quarts of a 20% antifreeze solution to obtain a 60% antifreeze solution?
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let x=quarts of pure antifreeze to be added.
20%*4+100%*x=60%(4+x)
.8+x=2.4+.6x
.4x=1.6
x=4
ans:
quarts of pure antifreeze to be added=4