SOLUTION: How much water must be evaporated from 200lbs of a 10% salt solution to yield a solution that is 20% salt?

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Question 535958: How much water must be evaporated from 200lbs of a 10% salt solution to yield a solution that is 20% salt?
Answer by richwmiller(17219) About Me  (Show Source):
You can put this solution on YOUR website!
200*.10=(200-x)*.2
x=100
half of the solution must evaporate