document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=521566>Question 521566</A>: <I><SPAN STYLE=\"word-break: break-all;\"> David can paint the outside of a house in 12 hr.  Bill can paint the same house in 9 hr.  How long will it take them working together to paint the house? </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #346525 by </B><A HREF=/tutors/aboutme.mpl?userid=richwmiller><B>richwmiller(17219)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=richwmiller><IMG SRC=http://www.algebra.com/images/aboutme-small.gif BORDER=0 alt=\"About Me\" VALIGN=MIDDLE></A>&nbsp;<IMG SRC=http://www.algebra.com/cgi-bin/show-face.mpl?user=richwmiller><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=346525\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> x/12+x/9=1<BR>\n" );
document.write( "9x/108+12x/108=1<BR>\n" );
document.write( "21x/108=1<BR>\n" );
document.write( "21x=108<BR>\n" );
document.write( "x=108/21<BR>\n" );
document.write( "x=9*12/3*7=<BR>\n" );
document.write( "x=3*12/7<BR>\n" );
document.write( "x=36/7<BR>\n" );
document.write( "x=5 1/7<BR>\n" );
document.write( "check<BR>\n" );
document.write( "36/7/12+36/7/9=1<BR>\n" );
document.write( "3/7+4/7=1<BR>\n" );
document.write( "1=1<BR>\n" );
document.write( "ok  </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );