document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=15154>Question 15154</A>: <I><SPAN STYLE=\"word-break: break-all;\"> three exam scores of 70, 60, and 40 what score would you need on the fourth exam to give an average of 72.0 </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #7531 by </B><A HREF=/tutors/aboutme.mpl?userid=pramboggle><B>pramboggle(1)</B></A><img src=\"/images/stars/iconNewId_16x16.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=pramboggle><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=7531\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> To find the mean (or average) of a problem you add together the numbers then divide by however many numbers there are.  In this case you only have 3 of the 4 numbers you need.  Use x for the fourth.\r<BR>\n" );
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document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=%28%2870%2B60%2B40%2Bx%29%2F%284%29%29=+72 ALIGN=MIDDLE  ALT=\"%28%2870%2B60%2B40%2Bx%29%2F%284%29%29=+72\"   DISABLED_style= \"max-width:90%; height:auto;\" >\r<BR>\n" );
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document.write( "Then yoy want to solve for x.  Make the 72 a <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=72%2F1 ALIGN=MIDDLE  ALT=\"72%2F1\"   DISABLED_style= \"max-width:90%; height:auto;\" >.\r<BR>\n" );
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document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=%28%2870%2B60%2B40%2Bx%29%2F%284%29%29=+%2872%2F1%29 ALIGN=MIDDLE  ALT=\"%28%2870%2B60%2B40%2Bx%29%2F%284%29%29=+%2872%2F1%29\"   DISABLED_style= \"max-width:90%; height:auto;\" > Then cross multiply.<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=%28%28170%2Bx%29%2F4%29=%2872%2F1%29 ALIGN=MIDDLE  ALT=\"%28%28170%2Bx%29%2F4%29=%2872%2F1%29\"   DISABLED_style= \"max-width:90%; height:auto;\" > <BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=1%28170%2Bx%29=%284%29%2872%29 ALIGN=MIDDLE  ALT=\"1%28170%2Bx%29=%284%29%2872%29\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=170%2Bx=288 ALIGN=MIDDLE  ALT=\"170%2Bx=288\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=x=118 ALIGN=MIDDLE  ALT=\"x=118\"   DISABLED_style= \"max-width:90%; height:auto;\" >\r<BR>\n" );
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document.write( "If you want to check your answer you go back and plug in 118 for x. \r<BR>\n" );
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document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=%2870%2B60%2B40%2B118%29%2F4=72 ALIGN=MIDDLE  ALT=\"%2870%2B60%2B40%2B118%29%2F4=72\"   DISABLED_style= \"max-width:90%; height:auto;\" >\r<BR>\n" );
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document.write( "It works! So 118 is your answer. </SPAN>\n" );
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