SOLUTION: 800 liters of a 79% glycol solution was available. How much pure glycol should be extracted so that the remainder would be only 30% glycol

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Question 1031694: 800 liters of a 79% glycol solution was available. How much pure glycol should be extracted so that the remainder would be only 30% glycol
Answer by josmiceli(19441) About Me  (Show Source):
You can put this solution on YOUR website!
Let +x+ = liters of pure glycol
to be extracted
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+.79%2A800+=+632+ liters of pure
glycol in 79% solution
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+800+-+x+ = liters of 79% glycol
solution remaining
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+632+-+x+ = liters of pure glycol
remaining
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+%28+632+-+x+%29+%2F+%28+800+-+x+%29+=+.3+
+632+-+x+=+.3%2A%28+800+-+x+%29+
+632+-+x+=+240+-+.3x+
+.7x+=+392+
+x+=+560+
560 liters of pure glycol should be extracted
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check the answer:
+632+-+560+=+72+ liters of pure glycol is left
+800+-+560+=+240+ liters of solution is left
+72%2F240+=+.3+
OK