document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=656316>Question 656316</A>: <I><SPAN STYLE=\"word-break: break-all;\"> the average of 3 numbers is 12. Two of the numbers are 7 and 13. <BR>\n" );
document.write( "What is the third number? </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #409486 by </B><A HREF=/tutors/aboutme.mpl?userid=checkley79><B>checkley79(3341)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=checkley79><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=409486\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> (7+13+X)/3=12<BR>\n" );
document.write( "(20+X)/3=12 CROSS MULTIPLY.<BR>\n" );
document.write( "20+X=36<BR>\n" );
document.write( "X=36-20<BR>\n" );
document.write( "X=16 ANS.<BR>\n" );
document.write( "PROOF:<BR>\n" );
document.write( "(7+13+16)/3=12<BR>\n" );
document.write( "36/3=12<BR>\n" );
document.write( "12=12 </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );