SOLUTION: how much water must be evaporated from 1300L of a 20% salt solution to get a 65% salt solution?

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Question 851404: how much water must be evaporated from 1300L of a 20% salt solution to get a 65% salt solution?
Answer by josmiceli(19441) About Me  (Show Source):
You can put this solution on YOUR website!
Let +w+ = liters of water to be evaporated
+.2%2A1300+=+260+ liters of salt in 20% solution
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The +260+ liters of salt is also in the final solution
+260+%2F+%28+1300+-+w+%29+=+.65+
+260+=+.65%2A%28+1300+-+w+%29+
+260+=+845+-+.65w+
+.65w+=+845+-+260+
+.65w+=+585+
+w+=+900+
900 liters of water need to be evaporated
check:
+260+%2F+%28+1300+-+w+%29+=+.65+
+260+%2F+%28+1300+-+900+%29+=+.65+
+260+%2F+400+=+.65+
+.65+=+.65+
OK