document.write( "Question 824909: Two pipes can fill a tank in 18 minutes & 27 minutes individually.A third pipe can empty the full tank in 6 minutes.All the three pipes are opened when the tank was 2/3 full.In how many minute will the tank become empty?
\n" ); document.write( "A)11
\n" ); document.write( "B)9
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Algebra.Com's Answer #496882 by AnlytcPhil(1806)\"\" \"About 
You can put this solution on YOUR website!
Here is the correction of the first tutor's method, using draining rate
\n" ); document.write( "instead of filling rate:
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\n" ); document.write( "The rate of DRAINING the tank is when all pipes are open,
\n" ); document.write( ", tanks per minute.\r
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\n" ); document.write( "\n" ); document.write( "The tank at 2/3 full and having all three pipes open would be drained
\n" ); document.write( "when m minutes pass: \"%282%2F27%29%2Am=2%2F3\"
\n" ); document.write( "\"m=%282%2F3%29%2827%2F2%29\"
\n" ); document.write( "\"m=9\" minutes
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document.write( "Edwin

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