document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=496656>Question 496656</A>: <I><SPAN STYLE=\"word-break: break-all;\"> A can do a piece of work in 10 days. After he has worked 2 days, B came to help him and together they finished it in 3 days. In how many days could B alone have done the work? Please give an answer. Thank you </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #336511 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=336511\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> In work problems, you add their rates of<BR>\n" );
document.write( "working to get their rate working together.<BR>\n" );
document.write( "A's rate is ( 1 job ) / ( 10 days ) = <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+1%2F10+ ALIGN=MIDDLE  ALT=\"+1%2F10+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "B's rate is ( 1 job ) / ( x days ) = <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( "-----------------------<BR>\n" );
document.write( "The question to ask is: \" What part of the job<BR>\n" );
document.write( "does A get done in 2 days?\"<BR>\n" );
document.write( "If he does 1 job in 10 days, he does 1/10<BR>\n" );
document.write( "of a job in 1 day. That means he does 2/10<BR>\n" );
document.write( "or 1/5 of a job in 2 days.<BR>\n" );
document.write( "-----------------------<BR>\n" );
document.write( "So, there is <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+1+-+1%2F5+=+4%2F5+ ALIGN=MIDDLE  ALT=\"+1+-+1%2F5+=+4%2F5+\"   DISABLED_style= \"max-width:90%; height:auto;\" > of the job left<BR>\n" );
document.write( "to do when B joins him<BR>\n" );
document.write( "So, they do 4/5 of the job together in 3 days<BR>\n" );
document.write( "-----------------------<BR>\n" );
document.write( "Adding their rates of working:<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+1%2F10+%2B+1%2Fx+=+%284%2F5%29%2F3+ ALIGN=MIDDLE  ALT=\"+1%2F10+%2B+1%2Fx+=+%284%2F5%29%2F3+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+1%2F10+%2B+1%2Fx+=+4%2F15+ ALIGN=MIDDLE  ALT=\"+1%2F10+%2B+1%2Fx+=+4%2F15+\"   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=+30x+ ALIGN=MIDDLE  ALT=\"+30x+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+3x+%2B+30+=+8x+ ALIGN=MIDDLE  ALT=\"+3x+%2B+30+=+8x+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+5x+=+30+ ALIGN=MIDDLE  ALT=\"+5x+=+30+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+x+=+6+ ALIGN=MIDDLE  ALT=\"+x+=+6+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "B alone could have done the work in 6 hours </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );