SOLUTION: what weight of water must be evaporated from 40lbs of a 20% salt solution to produce 50% solution?

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Question 470853: what weight of water must be evaporated from 40lbs of a 20% salt solution to produce 50% solution?
Answer by lwsshak3(11628) About Me  (Show Source):
You can put this solution on YOUR website!
what weight of water must be evaporated from 40lbs of a 20% salt solution to produce 50% solution?
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let x= lbs of water to be evaporated
amount of salt does not change, but solution has less water
20%*40=50%(40-x)
8=20-x/2
x/2=12
x=24
ans:
24 lbs of water must be evaporated to produce a 50% solution.