document.write( "Question 1139010: A,B and C can do a job in 4 days . B can do it in 9 days and C can do it in 8 days . How long would it take A to do it himself ? \n" ); document.write( "
Algebra.Com's Answer #756828 by MathTherapy(10552)\"\" \"About 
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\n" ); document.write( "A,B and C can do a job in 4 days . B can do it in 9 days and C can do it in 8 days . How long would it take A to do it himself ?
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Let time A takes be A
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document.write( "Then when A, B, and C work together, they perform: \"matrix%281%2C6%2C+1%2FA%2C+%22%2C%22%2C+1%2F9%2C+%22%2C%22%2C+and%2C+1%2F8%29\" of work, respectively 
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document.write( "Then we get: \"matrix%281%2C3%2C+4+%2A+%281%2FA+%2B+1%2F9+%2B+1%2F8%29%2C+%22=%22%2C+1%29\"
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document.write( "\"matrix%281%2C3%2C+4%2FA+%2B+4%2F9+%2B+1%2F2%2C+%22=%22%2C+1%29\"
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document.write( "4(18) + 4(2A) + 9A = 18A ------- Multiplying by LCD, 18A
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document.write( "72 + 8A + 9A = 18A
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document.write( "72 = 18A - 17A
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document.write( "Time A takes to do the job, alone, or \"highlight_green%28matrix%281%2C4%2C+A%2C+%22=%22%2C+72%2C+days%29%29\" \n" );
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