document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=1141684>Question 1141684</A>: <I><SPAN STYLE=\"word-break: break-all;\"> The twenty first term of an ap is five and a half while the sum of the twenty one terms is ninetyfour and a half.find the sum of the first 3 terms of 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 #762293 by </B><A HREF=/tutors/aboutme.mpl?userid=greenestamps><B>greenestamps(13203)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=greenestamps><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=greenestamps><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=762293\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> <br><BR>\n" );
document.write( "(1) The sum of 21 terms of an AP is 21 times the average of the first and last.  Let the first term be x; then<br><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=189%2F2+=+21%28%28x%2B11%2F2%29%2F2%29 ALIGN=MIDDLE  ALT=\"189%2F2+=+21%28%28x%2B11%2F2%29%2F2%29\"   DISABLED_style= \"max-width:90%; height:auto;\" ><br><BR>\n" );
document.write( "Solve to find the first term.<br><BR>\n" );
document.write( "(2) The 21st term is the first term plus the common difference d 20 times.  Use the given 21st term and the first term from (1) above to find the common difference d.<br><BR>\n" );
document.write( "(3) Use the common difference and the first term to find the second and third terms.<br><BR>\n" );
document.write( "(4) Add the first three terms to get the answer to the problem. </SPAN>\n" );
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