SOLUTION: how much water must be evaporated from 5 liters of 25% salt solution if the remaining solution must be 50%?

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Question 471083: how much water must be evaporated from 5 liters of 25% salt solution if the remaining solution must be 50%?
Found 2 solutions by Tatiana_Stebko, Alan3354:
Answer by Tatiana_Stebko(1539) About Me  (Show Source):
You can put this solution on YOUR website!
If we have 5 liters of 25% salt solution, then in this solution 5%2A0.25=1.25liters of salt
In new (50%) solution will be the same, 1.25 litters of salt, but it will be 50% of solution, so all solution has 1.25%2A100%2F50=3 liters
5-3=2liters of water must be evaporated from 5 liters of 25% salt solution

Answer by Alan3354(69443) About Me  (Show Source):
You can put this solution on YOUR website!
25% of 5 liters = 1.25 liters of salt
For that to be 50%, there has to be 1.25 liters of water --> 2.5 liters total.
5 - 2.5 = 2.5 liters to evaporate.