SOLUTION: how much water should be added to 24mL of 13% alchol solution to reduce the concentration to 12%

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Question 918193: how much water should be added to 24mL of 13% alchol solution to reduce the concentration to 12%
Answer by josmiceli(19441) About Me  (Show Source):
You can put this solution on YOUR website!
Let +x+ = ml of water to be added
+.13%2A24+=+3.12+ ml of alcohol in 24% solution
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+3.12+%2F+%28+x+%2B+24+%29+=+.12+
+3.12+=+.12%2A%28+x+%2B+24+%29+
+3.12+=+.12x+%2B+2.88+
+.12x+=+3.12+-+2.88+
+.12x+=+.24+
+x+=+2+
2 ml of water needs to be added
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check:
+3.12+%2F+%28+x+%2B+24+%29+=+.12+
+3.12+%2F+%28+2+%2B+24+%29+=+.12+
+3.12+%2F+26+=+.12+
+3.12+=+.12%2A26+
+3.12+=+3.12+
OK