SOLUTION: how many liters of water must be evaporated from 220 L of a solution that is 5% salt, to leave a solution that is 5.5% salt?

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Question 713884: how many liters of water must be evaporated from 220 L of a solution that is 5% salt, to leave a solution that is 5.5% salt?
Answer by josmiceli(19441) About Me  (Show Source):
You can put this solution on YOUR website!
Let +w+ = liters of water to be evaporated
+.05%2A220+=+11+ liters of salt in 5% solution
The amount of salt never changes
+11+%2F+%28+220+-+w+%29+=+.055+
+11+=+.055%2A%28+220+-+w+%29+
+11+=+.055%2A220+-+.055w+
+11+=+12.1+-+.055w+
+.055w+=+12.1+-+11+
+.055w+=+1.1+
+w+=+20+
20 liters of water must be evaporated
check:
+11+%2F+%28+220+-+w+%29+=+.055+
+11+%2F+%28+220+-+20+%29+=+.055+
+11+%2F+200+=+.055+
+11+=+11+
OK