SOLUTION: How much water should be evaporated from 100 liters of 40% vinegar solution to increase the acidity to 80%?

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Question 947840: How much water should be evaporated from 100 liters of 40% vinegar solution to increase the acidity to 80%?
Answer by Fombitz(32388) About Me  (Show Source):
You can put this solution on YOUR website!
A 40% solution would have 40 liters of vinegar and 60 liters of water.
%2840%29%2F%2840%2B60%29=40%2F100=0.4
An 80% solution with 40 liters of vinegar would have 10 liters of water.
%2840%2F%2840%2B10%29%29=4%2F5=0.8%29
You need to evaporate 50 liters of water.
60-10=50