SOLUTION: How much water must be evaporated from 14 qt. of a 65% antfreeze solution to producea 70% solution?

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Question 572706: How much water must be evaporated from 14 qt. of a 65% antfreeze solution to producea 70% solution?
Answer by lwsshak3(11628) About Me  (Show Source):
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How much water must be evaporated from 14 qt. of a 65% antfreeze solution to producea 70% solution?
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let x=quarts of water that must be evaporated
65%*14=70%*(14-x)
9.1=9.8-.7x
.7x=.7
x=1 qt
ans:
quarts of water that must be evaporated=1