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 #346523 by </B><A HREF=/tutors/aboutme.mpl?userid=stanbon><B>stanbon(75887)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=stanbon><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/images/nopicture.jpg><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=346523\">put this solution on YOUR website!</A><BR><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?<BR>\n" );
document.write( "-----<BR>\n" );
document.write( "David rate = 1/12 job/hr<BR>\n" );
document.write( "---<BR>\n" );
document.write( "Bill rate = 1/9 job/hr<BR>\n" );
document.write( "----<BR>\n" );
document.write( "Together rate = 1/x job/hr<BR>\n" );
document.write( "-----<BR>\n" );
document.write( "Equation:<BR>\n" );
document.write( "rate + rate = together rate<BR>\n" );
document.write( "1/12 + 1/9 = 1/x<BR>\n" );
document.write( "9x + 12x = 9*12<BR>\n" );
document.write( "21x = 9*12<BR>\n" );
document.write( "7x = 9*4<BR>\n" );
document.write( "x = 36/7 is approximately = 5 hrs 9 minutes<BR>\n" );
document.write( "==============<BR>\n" );
document.write( "Cheers,<BR>\n" );
document.write( "Stan H.<BR>\n" );
document.write( "============== </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );