SOLUTION: How much ater must be evaporated from 60 kilograms of 15% salt solution in order to obtain 40% solution?

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Question 789316: How much ater must be evaporated from 60 kilograms of 15% salt solution in order to obtain 40% solution?
Answer by josmiceli(19441) About Me  (Show Source):
You can put this solution on YOUR website!
Let +w+ = kg of water to be evaporated
+.15%2A60+=+9+ kg of salt in 15% solution
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+9+%2F+%28+60+-+w+%29+=+.4+
+9+=+.4%2A%28+60+-+w+%29+
+9+=+24+-+.4w+
+.4w+=+24+-+9+
+.4w+=+15+
+w+=+37.5+
37.5 kg of water must be evaporated
check:
+9+%2F+%28+60+-+w+%29+=+.4+
+9+%2F+%28+60+-+37.5+%29+=+.4+
+9+%2F+22.5+=+.4+
+9+=+.4%2A22.5+
+9+=+9+
OK