SOLUTION: How much water must be boiled off from 40 liters of a 30% salt solution to produce a 80% salt solution?

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Question 149895: How much water must be boiled off from 40 liters of a 30% salt solution to produce a 80% salt solution?
Answer by checkley77(12569) About Me  (Show Source):
You can put this solution on YOUR website!
.3*40=12 amount of salt in the mixture.
.8x=12
x=12/.8
x=15 L is 80% salt mixture.
40-15=25 L must be boiled off.