Question 1152168
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Use the percentages to determine how many quarts are in the solution after the water has been evaporated; then use that to determine how much water needs to be evaporated.<br>
{{{.65(17) = .85(x)}}}<br>
{{{x = (.65(17))/(.85) = (65*17)/(85) = 65/5 = 13}}}<br>
There need to be 13 quarts in the final mixture for it to be 85% antifreeze; since there were 17 quarts at the start, 4 quarts were evaporated.<br>