SOLUTION: how much water should be evaporated from 200 L of 60% vinegar solution to increase the acidity to 90%

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Question 754802: how much water should be evaporated from 200 L of 60% vinegar solution to increase the acidity to 90%
Answer by josmiceli(19441) About Me  (Show Source):
You can put this solution on YOUR website!
Let +x+ = liters of water to be evaporated
+.6%2A200+=+120+ liters of vinegar in 60% solution
----------------
+120+%2F+%28+200+-+x+%29+=+.9+
+120+=+.9%2A%28+200+-+x+%29+
+120+=+180+-+.9x+
+.9x+=+180+-+120+
+.9x+=+60+
+x+=+66.667+
66.667 liters of water should be evaporated
check:
+120+%2F+%28+200+-+x+%29+=+.9+
+120+%2F+%28+200+-+66.667+%29+=+.9+
+120+%2F+133.333+=+.9+
+120+=+120+
OK