document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=1006272>Question 1006272</A>: <I><SPAN STYLE=\"word-break: break-all;\"> I do not know how to formulate or resolve this problem: (thank you for your help)\r<BR>\n" );
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document.write( "Joseph takes 15 minutes to do the laundry. Mark takes 4 minutes more to do the laundry by himself than when Joseph and Mark do it together. How much time will it take to Joseph and Mark to do the laundry if they do it together? </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #622433 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=622433\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> Add their rates of working to get<BR>\n" );
document.write( "their rate working together<BR>\n" );
document.write( "Joseph's rate is:<BR>\n" );
document.write( "[ 1 laundry ] / ( 15 min ] = <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+1%2F15+ ALIGN=MIDDLE  ALT=\"+1%2F15+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "-----------------------------<BR>\n" );
document.write( "Let <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+t+ ALIGN=MIDDLE  ALT=\"+t+\"   DISABLED_style= \"max-width:90%; height:auto;\" > = time in minutes for Mark<BR>\n" );
document.write( "and  Joseph to do laundry working together<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+1%2Ft+ ALIGN=MIDDLE  ALT=\"+1%2Ft+\"   DISABLED_style= \"max-width:90%; height:auto;\" > is their rate working together<BR>\n" );
document.write( "-----------------------------<BR>\n" );
document.write( "Mark's rate when working alone is:<BR>\n" );
document.write( "[ 1 laundry ] / [ t + 4  min ] = <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+1%2F%28+t%2B4+%29+ ALIGN=MIDDLE  ALT=\"+1%2F%28+t%2B4+%29+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "------------------------------<BR>\n" );
document.write( "Add rates of working:<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+1%2F15+%2B+1%2F%28+t%2B4+%29+=+1%2Ft+ ALIGN=MIDDLE  ALT=\"+1%2F15+%2B+1%2F%28+t%2B4+%29+=+1%2Ft+\"   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=+15%2At%2A%28+t%2B4+%29+ ALIGN=MIDDLE  ALT=\"+15%2At%2A%28+t%2B4+%29+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "---------------------------------<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+t%2A%28+t%2B4+%29+%2B+15t+=+15%2A%28+t%2B4+%29+ ALIGN=MIDDLE  ALT=\"+t%2A%28+t%2B4+%29+%2B+15t+=+15%2A%28+t%2B4+%29+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+t%5E2+%2B+4t+%2B+15t+=+15t+%2B+60+ ALIGN=MIDDLE  ALT=\"+t%5E2+%2B+4t+%2B+15t+=+15t+%2B+60+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+t%5E2+%2B+4t+-+60+=+0+ ALIGN=MIDDLE  ALT=\"+t%5E2+%2B+4t+-+60+=+0+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+%28+t+%2B+10+%29%2A%28+t+-+6+%29+ ALIGN=MIDDLE  ALT=\"+%28+t+%2B+10+%29%2A%28+t+-+6+%29+\"   DISABLED_style= \"max-width:90%; height:auto;\" > ( by looking at it )<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+t+=+6+ ALIGN=MIDDLE  ALT=\"+t+=+6+\"   DISABLED_style= \"max-width:90%; height:auto;\" > ( time must be positive )<BR>\n" );
document.write( "They can do the laundry together in 6 min<BR>\n" );
document.write( "-----------------<BR>\n" );
document.write( "check:<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+1%2F15+%2B+1%2F%28+t%2B4+%29+=+1%2Ft+ ALIGN=MIDDLE  ALT=\"+1%2F15+%2B+1%2F%28+t%2B4+%29+=+1%2Ft+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+1%2F15+%2B+1%2F%286%2B4+%29+=+1%2F6+ ALIGN=MIDDLE  ALT=\"+1%2F15+%2B+1%2F%286%2B4+%29+=+1%2F6+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+1%2F15+%2B+1%2F10+=+1%2F6+ ALIGN=MIDDLE  ALT=\"+1%2F15+%2B+1%2F10+=+1%2F6+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+4%2F60+%2B+6%2F60+=+10%2F60+ ALIGN=MIDDLE  ALT=\"+4%2F60+%2B+6%2F60+=+10%2F60+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+10%2F60+=+10%2F60+ ALIGN=MIDDLE  ALT=\"+10%2F60+=+10%2F60+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "OK </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );