document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=904053>Question 904053</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Twin brothers, Billy and Bobby, can mow their grandparent's lawn together in 117 minutes. Billy could mow the lawn by himself in 40 minutes less time that it would take Bobby. How long would it take Bobby to mow the lawn by himself?  </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #548475 by </B><A HREF=/tutors/aboutme.mpl?userid=josgarithmetic><B>josgarithmetic(39617)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=josgarithmetic><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=548475\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> Form expressions for each rate in LAWNS per MINUTE.  Let x = time for Bobby to mow lawn himself, alone.\r<BR>\n" );
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document.write( "RATES<BR>\n" );
document.write( "Billy, <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=1%2F%28x-40%29 ALIGN=MIDDLE  ALT=\"1%2F%28x-40%29\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "Bobby, <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=1%2Fx ALIGN=MIDDLE  ALT=\"1%2Fx\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "Billy & Bobby Together, <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=1%2F117 ALIGN=MIDDLE  ALT=\"1%2F117\"   DISABLED_style= \"max-width:90%; height:auto;\" >\r<BR>\n" );
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document.write( "Rate of both together is the sum of their individual rates:<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=highlight%281%2F%28x-40%29%2B1%2Fx=1%2F117%29 ALIGN=MIDDLE  ALT=\"highlight%281%2F%28x-40%29%2B1%2Fx=1%2F117%29\"   DISABLED_style= \"max-width:90%; height:auto;\" >;<BR>\n" );
document.write( "so just solve for x. </SPAN>\n" );
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