document.write( "Question 1041930: It takes Brenda 15 hours to clean an attic. Danielle can clean the same attic in 13 hours. How long would it take them if they worked together. \n" ); document.write( "
Algebra.Com's Answer #656839 by Edwin McCravy(20059)\"\" \"About 
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document.write( "Their rates are \"matrix%281%2C2%2C1%2Cattic%29%2Fmatrix%281%2C2%2C15%2Chours%29\" and \"matrix%281%2C2%2C1%2Cattic%29%2Fmatrix%281%2C2%2C13%2Chours%29\"\r\n" );
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document.write( "Their combined rate is the sum of their rates \"1%2F15%2B1%2F13\". \r\n" );
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document.write( "Since \"TIME=matrix%281%2C3%2CNUMBER%2COF%2CJOBS%29%2Fmatrix%281%2C3%2CTHEIR%2CCOMBINED%2CRATE%29\"\r\n" );
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document.write( "Then since they are to do 1 job, the number of jobs is 1, and\r\n" );
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document.write( "\"1%2F%281%2F15%2B1%2F13%29\"\r\n" );
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document.write( "Multiply top and bottom by LCD = 15∙13=195\r\n" );
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document.write( "\"1%2A195%2F%28%281%2F15%2B1%2F13%29%2A195%29\"\r\n" );
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document.write( "\"195%2F%28195%2F15%2B195%2F13%29\"\r\n" );
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document.write( "\"195%2F%2813%2B15%29\"\r\n" );
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document.write( "\"195%2F28\"\r\n" );
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document.write( "\"matrix%281%2C2%2C6%2627%2F28%2Chours%29\"\r\n" );
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document.write( "Edwin
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