document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=16110>Question 16110</A>: <I><SPAN STYLE=\"word-break: break-all;\"> One crew can put up holiday decorations in the mall in 9 hours. A second crew can put up the decorations in 7 hours. How long will it take if both crews work together to decorate the mall? Please enter your answer as a number without the units. </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #27579 by </B><A HREF=/tutors/aboutme.mpl?userid=fractalier><B>fractalier(6550)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=fractalier><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=fractalier><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=27579\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> We use the equation<BR>\n" );
document.write( "t/A + t/B = 1<BR>\n" );
document.write( "now plug in to solve for t...<BR>\n" );
document.write( "t/7 + t/9 = 1<BR>\n" );
document.write( "multiply by the LCD, 63, and get<BR>\n" );
document.write( "9t + 7t = 63<BR>\n" );
document.write( "16t = 63<BR>\n" );
document.write( "t = 63/16 hours or<BR>\n" );
document.write( "t = 3 15/16 hours if you need it mixed... </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );