document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=737174>Question 737174</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Jerry and Sam are laying a hardwood floor. Working alone, Jerry can do the job in 20 hours. If the two of them work together, they can complete the job  in 12 hours. How long would it take Sam to lay the floor working alone?\r<BR>\n" );
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document.write( "I need help which math formula to use and how to perform steps for that formula. <BR>\n" );
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document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #450197 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=450197\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> The key is to know that you add their rates of<BR>\n" );
document.write( "working to get their rate of working together<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;\" > = Sam's time in hrs to do the job working alone<BR>\n" );
document.write( "Jerry's rate: ( 1 job ) / ( 20 hrs )<BR>\n" );
document.write( "Sam\"s rate: ( 1 job ) / ( t hrs )<BR>\n" );
document.write( "rate working together: ( 1 job ) / ( 1 hrs )<BR>\n" );
document.write( "----------------------<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+1%2F20+%2B+1%2Ft+=+1%2F12+ ALIGN=MIDDLE  ALT=\"+1%2F20+%2B+1%2Ft+=+1%2F12+\"   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=+12%2A20%2At+ ALIGN=MIDDLE  ALT=\"+12%2A20%2At+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+12t+%2B+12%2A20+=+20t+ ALIGN=MIDDLE  ALT=\"+12t+%2B+12%2A20+=+20t+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+8t+=+240+ ALIGN=MIDDLE  ALT=\"+8t+=+240+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+t+=+30+ ALIGN=MIDDLE  ALT=\"+t+=+30+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "Sam would take 30 hrs to do the job working alone<BR>\n" );
document.write( "check:<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+1%2F20+%2B+1%2Ft+=+1%2F12+ ALIGN=MIDDLE  ALT=\"+1%2F20+%2B+1%2Ft+=+1%2F12+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+1%2F20+%2B+1%2F30+=+1%2F12+ ALIGN=MIDDLE  ALT=\"+1%2F20+%2B+1%2F30+=+1%2F12+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+3%2F60+%2B+2%2F60+=+5%2F60+ ALIGN=MIDDLE  ALT=\"+3%2F60+%2B+2%2F60+=+5%2F60+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+5%2F60+=+5%2F60+ ALIGN=MIDDLE  ALT=\"+5%2F60+=+5%2F60+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "OK </SPAN>\n" );
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