SOLUTION: How much water was evaporated from 7L of a 52% salt solution to produce a solution that was 91% salt?

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Question 690824: How much water was evaporated from 7L of a 52% salt solution to produce a solution that was 91% salt?
Answer by josmiceli(19441) About Me  (Show Source):
You can put this solution on YOUR website!
How much salt is in the original solution?
+.52%2A7+=+3.64+ liters
Let +w+ = liters of water that was evaporated
+3.64+%2F+%28+7+-+w+%29+=+.91+
+3.64+=+.91%2A%28+7+-+w+%29+
+3.64+=+6.37+-+.91w+
+.91w+=+6.37+-+3.64+
+.91w+=+2.73+
+w+=+2.73+%2F+.91+
+w+=+3+
3 liters of water must be evaporated
check:
+3.64+%2F+%28+7+-+w+%29+=+.91+
+3.64+%2F+%28+7+-+3+%29+=+.91+
+3.64+%2F+4+=+.91+
+3.64+=+.91%2A4+
+3.64+=+3.64+
OK