document.write( "Question 653990: If sally can paint a room in 9 hours, and it takes dave 5 hours to paint the same room, how long will it take them if they work together? \n" ); document.write( "

Algebra.Com's Answer #408591 by checkley79(3341) $\"\"$ $\"About$

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1/9+1/5=1/X FIND A COMMON DENOMINATOR (9*5)=45
\n" ); document.write( "[(1*5)+(1*9)]/45=1/X
\n" ); document.write( "[5+9]/45=1/X
\n" ); document.write( "14/45=1/X CROSS MULTIPLY.
\n" ); document.write( "14X=45
\n" ); document.write( "X=45/14
\n" ); document.write( "X=3.2 HOURS WORKING TOGETHER.
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