SOLUTION: How much water must be evaporated from 17 qt of a 50% antifreeze solution to produce an 85% solution?

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Question 942323: How much water must be evaporated from 17 qt of a 50% antifreeze solution to produce an 85% solution?
Answer by lwsshak3(11628) About Me  (Show Source):
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How much water must be evaporated from 17 qt of a 50% antifreeze solution to produce an 85% solution?
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let x=amt of water must be evaporated
50%*17=85%(17-x)
8.5=14.45-.85x
.85x=5.95
x=7
How much water must be evaporated? 7 qts