document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=988327>Question 988327</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Benny can clean attic in 8 hours.  If Donna helps, it takes them 5 hours.  Without help, how long would it take Donna to do the same thing </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #608875 by </B><A HREF=/tutors/aboutme.mpl?userid=josmiceli><B>josmiceli(19441)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=josmiceli><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=josmiceli><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=608875\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> Add their rates of cleaning to get rate working together<BR>\n" );
document.write( "Benny's rate:<BR>\n" );
document.write( "[ 1 attic cleaned ] / [ 8 hrs ]<BR>\n" );
document.write( "-------------------------<BR>\n" );
document.write( "Donna's rate:<BR>\n" );
document.write( "[ 1 attic cleaned ] / [ t hrs ]<BR>\n" );
document.write( "-------------------------<BR>\n" );
document.write( "Rate working together:<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+1%2F8+%2B+1%2Ft+=+1%2F5+ ALIGN=MIDDLE  ALT=\"+1%2F8+%2B+1%2Ft+=+1%2F5+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "Multiply both sides by <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+40t+ ALIGN=MIDDLE  ALT=\"+40t+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+5t+%2B+40+=+8t+ ALIGN=MIDDLE  ALT=\"+5t+%2B+40+=+8t+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+3t+=+40+ ALIGN=MIDDLE  ALT=\"+3t+=+40+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+t+=+13.333+ ALIGN=MIDDLE  ALT=\"+t+=+13.333+\"   DISABLED_style= \"max-width:90%; height:auto;\" > hrs<BR>\n" );
document.write( "Note that <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+%281%2F3%29%2A60+=+20+ ALIGN=MIDDLE  ALT=\"+%281%2F3%29%2A60+=+20+\"   DISABLED_style= \"max-width:90%; height:auto;\" > min<BR>\n" );
document.write( "Working alone, Donna would take<BR>\n" );
document.write( "13 hrs and 20 min to clean the attic<BR>\n" );
document.write( "---------------------------------<BR>\n" );
document.write( "check answer:<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+1%2F8+%2B+1%2Ft+=+1%2F5+ ALIGN=MIDDLE  ALT=\"+1%2F8+%2B+1%2Ft+=+1%2F5+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+1%2F8+%2B+1%2F13.333+=+1%2F5+ ALIGN=MIDDLE  ALT=\"+1%2F8+%2B+1%2F13.333+=+1%2F5+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+.125+%2B+.075+=+.2+ ALIGN=MIDDLE  ALT=\"+.125+%2B+.075+=+.2+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+.2+=+.2+ ALIGN=MIDDLE  ALT=\"+.2+=+.2+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "OK </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );