document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=306207>Question 306207</A>: <I><SPAN STYLE=\"word-break: break-all;\"> The average of four numbers is  24.  if the largest number is left out  , the average is 20. . if the smallest is left out , the average is 30. what is the average of the middle two numbers ?\r<BR>\n" );
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document.write( "a   25   b    26   c  27   d  28   e  none of these\r<BR>\n" );
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document.write( " </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #219189 by </B><A HREF=/tutors/aboutme.mpl?userid=Fombitz><B>Fombitz(32388)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=Fombitz><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=Fombitz><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=219189\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> Let A,B,C,D be your numbers in increasing value. <BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=%28A%2BB%2BC%2BD%29%2F4=24 ALIGN=MIDDLE  ALT=\"%28A%2BB%2BC%2BD%29%2F4=24\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=%28A%2BB%2BC%29%2F3=20 ALIGN=MIDDLE  ALT=\"%28A%2BB%2BC%29%2F3=20\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=%28B%2BC%2BD%29%2F3=30 ALIGN=MIDDLE  ALT=\"%28B%2BC%2BD%29%2F3=30\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "Let's substitute,<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=Z=B%2BC ALIGN=MIDDLE  ALT=\"Z=B%2BC\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( ".<BR>\n" );
document.write( ".<BR>\n" );
document.write( ".<BR>\n" );
document.write( "1.<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=A%2BZ%2BD=96 ALIGN=MIDDLE  ALT=\"A%2BZ%2BD=96\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "2.<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=A%2BZ=60 ALIGN=MIDDLE  ALT=\"A%2BZ=60\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "3.<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=Z%2BD=90 ALIGN=MIDDLE  ALT=\"Z%2BD=90\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "From eq. 2,<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=A%2BZ=60 ALIGN=MIDDLE  ALT=\"A%2BZ=60\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=A=60-Z ALIGN=MIDDLE  ALT=\"A=60-Z\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "From eq. 3,<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=Z%2BD=90 ALIGN=MIDDLE  ALT=\"Z%2BD=90\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=D=90-Z ALIGN=MIDDLE  ALT=\"D=90-Z\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "Substitute these into eq. 1,<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=A%2BZ%2BD=96 ALIGN=MIDDLE  ALT=\"A%2BZ%2BD=96\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=%2860-Z%29%2BZ%2B%2890-Z%29=96 ALIGN=MIDDLE  ALT=\"%2860-Z%29%2BZ%2B%2890-Z%29=96\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=150-Z=96 ALIGN=MIDDLE  ALT=\"150-Z=96\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=Z=54 ALIGN=MIDDLE  ALT=\"Z=54\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "So then<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=B%2BC=54 ALIGN=MIDDLE  ALT=\"B%2BC=54\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "We're looking for <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=%28B%2BC%29%2F2 ALIGN=MIDDLE  ALT=\"%28B%2BC%29%2F2\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=%28B%2BC%29%2F2=27 ALIGN=MIDDLE  ALT=\"%28B%2BC%29%2F2=27\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( ".<BR>\n" );
document.write( ".<BR>\n" );
document.write( ".<BR>\n" );
document.write( "c) is the correct answer. </SPAN>\n" );
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