document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=1168156>Question 1168156</A>: <I><SPAN STYLE=\"word-break: break-all;\"> To earn an A in a course, a student must get an average score of 90 on five<BR>\n" );
document.write( "tests. If her first four scores are 92, 86, 79, and 96, what score does she need<BR>\n" );
document.write( "on the last test to obtain a 90 average? </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #792762 by </B><A HREF=/tutors/aboutme.mpl?userid=greenestamps><B>greenestamps(13200)</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=792762\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> <br><BR>\n" );
document.write( "An average of 90 on 5 tests means a total of 450 points:<br><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=92%2B86%2B79%2B96%2Bx+=+450 ALIGN=MIDDLE  ALT=\"92%2B86%2B79%2B96%2Bx+=+450\"   DISABLED_style= \"max-width:90%; height:auto;\" ><br><BR>\n" );
document.write( "Solve for x using basic algebra.<br><BR>\n" );
document.write( "In cases like this involving the average of a set of numbers that are all close together, there is another quick way to solve the problem -- by balancing the \"overs\" and \"unders\".<br><BR>\n" );
document.write( "Comparing each score to the desired average....<br><PRE STYLE=\"white-space: pre-wrap; white-space: -moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: break-word;\">\r\n" );
document.write( "   92:  +2\r\n" );
document.write( "   86:  -4\r\n" );
document.write( "   79: -11\r\n" );
document.write( "   96:  +6\r\n" );
document.write( "   -------\r\n" );
document.write( " total: -7</PRE><br><BR>\n" );
document.write( "Through the first four tests, the student is 7 points under the total they need, so the 5th test must be 7 points over the desired average.<br><BR>\n" );
document.write( "ANSWER: 90+7 = 97<br><BR>\n" );
document.write( " </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );