SOLUTION: How much water must be evaporated from 17 qt of a 75% antifreeze solution to produce an 85% solution?

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Question 943484: How much water must be evaporated from 17 qt of a 75% 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 75% antifreeze solution to produce an 85% solution?
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let x=amt of water must be evaporated
75%*17=85%*(17-x)
12.75=14.45-.85x
.85x=1.7
x=2
How much water must be evaporated? 2 qts