Algebra.Com's Answer #424153 by Edwin McCravy(20060)![\"\"](\"/images/stars/stars-13.gif\")  
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if 3 people can build a wall in 25 minutes, how long will it take for 5 people to build the same wall
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document.write( "First way:\r\n" );
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document.write( "The LCM of 3 people and 5 people is 15 people. 15 people can build a wall in\r\n" );
document.write( "1/5 the the time that only 3 people can or 1/5th of 25 minutes, or 5 minutes.\r\n" );
document.write( "5 people will take 3 times as long as 15 people, and 3 times 5 minutes is 15\r\n" );
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document.write( "Second way:\r\n" );
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document.write( "Use the worker-time-job formula, which is:\r\n" );
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document.write( "W1 = the number of workers in the first situation.\r\n" );
document.write( "T1 = the number of time units (minutes in this case) in the first situation.\r\n" );
document.write( "J1 = the number of jobs in the first situation.\r\n" );
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document.write( "W2 = the number of workers in the second situation.\r\n" );
document.write( "T2 = the number of time units (minutes in this case) in the second situation.\r\n" );
document.write( "J2 = the number of jobs in the second situation.\r\n" );
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document.write( "W1 = 15 W2 = 5 \r\n" );
document.write( "T1 = 25 T2 = the unknown quantity \r\n" );
document.write( "J1 = 1 J2 = 1\r\n" );
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document.write( "Answer: 15 minutes.\r\n" );
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document.write( "Edwin \n" );
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