SOLUTION: One liter of 10% alcohol is mixed with 3 liters of 30% alcohol. What is the percentage of alcohol in the resulting mixture?

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Question 940371: One liter of 10% alcohol is mixed with 3 liters of 30% alcohol. What is the percentage of alcohol in the resulting mixture?
Answer by josmiceli(19441) About Me  (Show Source):
You can put this solution on YOUR website!
+.1%2A1+=+.1+ liters of alcohol in 10% mixture
+.3%2A3+=+.9+ liters of alcohol in 30% mixture
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+%28+.1+%2B+.9+%29+%2F+%28+1+%2B+3+%29+=+1%2F4+
+1%2F4+=+.25+
+.25%2A100+=+25+
the mixture is 25% alcohol