document.write( "Question 441055: Mike paints a room in 5 hours. Mary paints the same room in 4 hours. Working together how long will it take them?
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Algebra.Com's Answer #312067 by richwmiller(17219)\"\" \"About 
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Let Mary do it all. Mike has more important things to do.
\n" ); document.write( "x/5+x/4=1
\n" ); document.write( "4x+5x=20
\n" ); document.write( "9x=20
\n" ); document.write( "x=20/9 2 2/9 hours.
\n" ); document.write( "They only gain 1 7/9 hours.
\n" ); document.write( "It would be a waste of time for Mike to travel over there to help her. He could get another job done instead of hauling equipment around.\r
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