document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=1105830>Question 1105830</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Benny can dust the house in 11 hours by himself but when Mary helps it take 7 hours how long would it take Mary to do this on her own. </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #720719 by </B><A HREF=/tutors/aboutme.mpl?userid=Boreal><B>Boreal(15235)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=Boreal><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=Boreal><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=720719\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> in one hour, B does 1/11 of the house and  together they do 1/7 of it in an hour.  Mary takes x hours and does 1/x per hour.<BR>\n" );
document.write( "(1/11)+(1/x)=1/7, equation for 1 hour<BR>\n" );
document.write( "multiply by 77x<BR>\n" );
document.write( "7x+77=11x<BR>\n" );
document.write( "4x=77<BR>\n" );
document.write( "x=19.75 hours, her time doing it.ANSWER<BR>\n" );
document.write( "In 7 hours, Benny does 7/11 and Mary does 7/19.75<BR>\n" );
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