document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=841450>Question 841450</A>: <I><SPAN STYLE=\"word-break: break-all;\"> An AP has 21 terms.The sum of 10th,11th, and 12th terms is 129 and the sum of the last 3 terms is 237. Find the AP </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #507106 by </B><A HREF=/tutors/aboutme.mpl?userid=richwmiller><B>richwmiller(17219)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=richwmiller><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=richwmiller><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=507106\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> a+10d+a+11d+a+12d=129,<BR>\n" );
document.write( "a+19d+a+20d+a+21d=237<BR>\n" );
document.write( "a = -1,   d = 4<BR>\n" );
document.write( "t=-1+4n\r<BR>\n" );
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