SOLUTION: How many liters of water should be evaporated from 60 liters of a 28% salt solution so that the remaining solution contains 32% salt?

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Question 781010: How many liters of water should be evaporated from 60 liters of a 28% salt solution so that the remaining solution contains 32% 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 from solution
+.28%2A60+=+16.8+ liters of salt in 28% solution
----------------------------
+16.8+%2F+%28+60+-+w+%29+=+.32+
+16.8+=+.32%2A%28+60+-+w+%29+
+16.8+=+19.2+-+.32w+
+.32w+=+19.2+-+16.8+
+.32w+=+2.4+
+w+=+7.5+
7.5 liters of water should be evaporated from the solution
check:
+16.8+%2F+%28+60+-+7.5+%29+=+.32+
+16.8+%2F+52.5+=+.32+
+16.8+=+.32%2A52.5+
+16.8+=+16.8+
OK