document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=1195114>Question 1195114</A>: <I><SPAN STYLE=\"word-break: break-all;\">  If Katie scored an 80, 83, and an 88 on her first<BR>\n" );
document.write( "three tests, what must she score on her fourth<BR>\n" );
document.write( "test if she wants an average of 85? Enter your<BR>\n" );
document.write( "answer in the text box below </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #827491 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=827491\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> <br><BR>\n" );
document.write( "When working a problem like this involving the average of a set of numbers that are all close together, you can keep the numbers in your calculations smaller by comparing the individual values to the average.  Compared to the desired average of 85....<br><BR>\n" );
document.write( "80 is 5 points below: -5<BR>\n" );
document.write( "83 is 2 points below: -2<BR>\n" );
document.write( "88 is 3 points above: +3<br><BR>\n" );
document.write( "Compared to the desired average, the first three scores together are 4 points below the average: (-5)+(-2)+(+3) = -4<br><BR>\n" );
document.write( "That means her score on the 4th test must be 4 points above the desired average.<br><BR>\n" );
document.write( "ANSWER: 85+4 = 89<br><BR>\n" );
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