document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=925250>Question 925250</A>: <I><SPAN STYLE=\"word-break: break-all;\"> A and B do a job in 12 days . A did for 8 days then rest job was done by B in 20 days. Find individually A and B can do in how many days. </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #561375 by </B><A HREF=/tutors/aboutme.mpl?userid=stanbon><B>stanbon(75887)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=stanbon><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=561375\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> A and B do a job in 12 days . A did for 8 days then rest job was done by B in 20 days. Find individually A and B can do in how many days.<BR>\n" );
document.write( "---<BR>\n" );
document.write( "Together rate:: 1/12 job/day<BR>\n" );
document.write( "A's rate:: 1/a job/day<BR>\n" );
document.write( "B's rate:: 1/b job/day<BR>\n" );
document.write( "-----<BR>\n" );
document.write( "Equations:<BR>\n" );
document.write( "1/a + 1/b = 1/12<BR>\n" );
document.write( "3(1/a) + 20(1/b) = 1<BR>\n" );
document.write( "----------<BR>\n" );
document.write( "Modify::<BR>\n" );
document.write( "12b + 12a = ab<BR>\n" );
document.write( "3b + 20a = ab<BR>\n" );
document.write( "-----<BR>\n" );
document.write( "Modify for elimination::<BR>\n" );
document.write( "12b + 12a = ab<BR>\n" );
document.write( "12b + 80a = 4ab<BR>\n" );
document.write( "----<BR>\n" );
document.write( "Subtract::<BR>\n" );
document.write( "68a = 2ab<BR>\n" );
document.write( "b = 34 days (time for B to do the job alone)<BR>\n" );
document.write( "---<BR>\n" );
document.write( "Solve for \"a\":<BR>\n" );
document.write( "1/a + 1/34 = 1/12<BR>\n" );
document.write( "1/a = 1/12 - 1/34<BR>\n" );
document.write( "1/a = (34-12)/(12*34)<BR>\n" );
document.write( "1/a = 22/(12*34)<BR>\n" );
document.write( "a = (12*34)/22<BR>\n" );
document.write( "a = 8.55 days (time for A to do the job alone)<BR>\n" );
document.write( "---------------------- </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );