document.write( "Question 785797: Joe can paint a room in 3 hours, fred can paint a room in 4 hours and Bill can paint a room in 6 hours. How long does it take them to paint a room togther? \n" ); document.write( "

Algebra.Com's Answer #477723 by josmiceli(19441) $\"\"$ $\"About$

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Add their rates of painting to get the
\n" ); document.write( "rate of all 3painting together
\n" ); document.write( "( 1 room )/( 3 hrs ) + ( 1 room )/( 4 hrs ) + ( 1 room )/( 6 hrs )
\n" ); document.write( "= ( 1 room )/( t hrs )
\n" ); document.write( "--------------------------
\n" ); document.write( " $\"+1%2F3+%2B+1%2F4+%2B+1%2F6+=+1%2Ft+\"$
\n" ); document.write( "Multiply both sides by $\"+12t+\"$
\n" ); document.write( " $\"+4t+%2B+3t+%2B+2t+=+12+\"$
\n" ); document.write( " $\"+9t+=+12+\"$
\n" ); document.write( " $\"+t+=+4%2F3+\"$
\n" ); document.write( " $\"+4%2F3+=+1+%2B+1%2F3+\"$
\n" ); document.write( " $\"+%281%2F3%29%2A60+=+20+\"$
\n" ); document.write( "It takes them 1 hr and 20 min to paint
\n" ); document.write( "the room together\r
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