document.write( "Question 1145948: Twin brothers, Billy and Bobby, can mow their grandparent's lawn together in 73 minutes. Billy could mow the lawn by himself in 35 minutes less time that it would take Bobby. How long would it take Bobby to mow the lawn by himself? \n" ); document.write( "

Algebra.Com's Answer #767230 by ikleyn(52781) $\"\"$ $\"About$

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document.write( "Let x = \"How long would it take Bobby to mow the lawn by himself\", i.e. the unknown value under the question.\r\n" );
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document.write( "Then your basic equation is \r\n" );
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document.write( "     +  = .\r\n" );
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document.write( "saying that\r\n" );
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document.write( "    Bobby's rate of work + Billy's rate of work = combined rate of work.\r\n" );
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document.write( "It is your basic equation. Solve it.\r\n" );
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document.write( "The first step is multiplying both sides by 73*x*(x-35).\r\n" );
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document.write( "After that reduce the equation to the standard form quadratic equation and solve by any method (factoring or quadratic formula).\r\n" );
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