SOLUTION: A vat contains 250 L of a saline solution with 15% salt. How much water must be allowed to evaporate to raise the concentration of salt up to 32%?

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Question 1054509: A vat contains 250 L of a saline solution with 15% salt. How much water must be allowed to evaporate to raise the concentration of salt up to 32%?
Answer by josmiceli(19441) About Me  (Show Source):
You can put this solution on YOUR website!
+.15%2A250+=+37.5+ liters of salt in 15% solution
Let +x+ = liters of water to be removed by evaporation
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+37.5+%2F+%28+250+-+x+%29+=+.32+
+37.5+=+.32%2A%28+250+-+x+%29+
+37.5+=+80+-+.32x+
+.32x+=+80+-+37.5+
+.32x+=+42.5+
+x+=+132.8125+
132.8125 liters of water must be evaporated
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check:
+37.5+%2F+%28+250+-+x+%29+=+.32+
+37.5+%2F+%28+250+-+132.8125+%29+=+.32+
+37.5+%2F+117.1875+=+.32+
+37.5+=+37.5+
OK