document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=442917>Question 442917</A>: <I><SPAN STYLE=\"word-break: break-all;\"> A teacher told Melinda that she has a course average of 78 based on her six math tests.  When she got home, she found 5 of her tests with scores of 87, 63, 79, 71, and 96.  She couldn't find the sixth test.  What score did she obtain on that test? </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #305539 by </B><A HREF=/tutors/aboutme.mpl?userid=Leaf+W.><B>Leaf W.(135)</B></A><img src=\"/images/stars/stars-09.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=Leaf+W.><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=Leaf+W.><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=305539\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> The average of a set of values is the sum of the values divided by the number of values. In this case (using x as the unknown value/test score), the values are 87, 63, 79, 71, 96, and x. The number of values/test scores is six, and you know that the average is 78. Therefore, you can use the equation <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=78+=+%2887+%2B+63+%2B+79+%2B+71+%2B+96+%2B+x%29%2F6 ALIGN=MIDDLE  ALT=\"78+=+%2887+%2B+63+%2B+79+%2B+71+%2B+96+%2B+x%29%2F6\"   DISABLED_style= \"max-width:90%; height:auto;\" >. Next, solve for x:\r<BR>\n" );
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document.write( "Multiply both sides of the equation by 6: <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=468+=+87+%2B+63+%2B+79+%2B+71+%2B+96+%2B+x ALIGN=MIDDLE  ALT=\"468+=+87+%2B+63+%2B+79+%2B+71+%2B+96+%2B+x\"   DISABLED_style= \"max-width:90%; height:auto;\" >\r<BR>\n" );
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document.write( "Simplify the right side of the equation by adding the values/test scores together: <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=468+=+396+%2B+x ALIGN=MIDDLE  ALT=\"468+=+396+%2B+x\"   DISABLED_style= \"max-width:90%; height:auto;\" >\r<BR>\n" );
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document.write( "Subtract 396 from both sides to isolate x: <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=72+=+x ALIGN=MIDDLE  ALT=\"72+=+x\"   DISABLED_style= \"max-width:90%; height:auto;\" >\r<BR>\n" );
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document.write( "Therefore, the missing test score must be 72. </SPAN>\n" );
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