document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=308430>Question 308430</A>: <I><SPAN STYLE=\"word-break: break-all;\"> What is the sum of the odd intergers between 10 and 90?<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 #220534 by </B><A HREF=/tutors/aboutme.mpl?userid=Alan3354><B>Alan3354(69443)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=Alan3354><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=Alan3354><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=220534\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> What is the sum of the odd intergers between 10 and 90?<BR>\n" );
document.write( "The easy way:<BR>\n" );
document.write( "There are 40 odd numbers from 10 to 90.<BR>\n" );
document.write( "Group them in 10 pairs from the outside in.  Each pair adds to 100.<BR>\n" );
document.write( "11 + 89 = 100<BR>\n" );
document.write( "13 + 87 = 100, etc<BR>\n" );
document.write( "20 pairs * 100 = 2000<BR>\n" );
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document.write( "PS It's integers, not intergers.<BR>\n" );
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