document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=498700>Question 498700</A>: <I><SPAN STYLE=\"word-break: break-all;\"> (3.)	The average of your first three test grades is 78.  What grade must you get on your fourth and final test to make your average 80? \r<BR>\n" );
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document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #337118 by </B><A HREF=/tutors/aboutme.mpl?userid=Earlsdon><B>Earlsdon(6294)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=Earlsdon><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=337118\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> First, let's find the sum of the first three test grades, which we'll call a, b, and c.<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=%28a%2Bb%2Bc%29%2F3+=+78 ALIGN=MIDDLE  ALT=\"%28a%2Bb%2Bc%29%2F3+=+78\"   DISABLED_style= \"max-width:90%; height:auto;\" > this is the average of the first three grades. Multiply both sides by 3.<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=a%2Bb%2Bc+=+234 ALIGN=MIDDLE  ALT=\"a%2Bb%2Bc+=+234\"   DISABLED_style= \"max-width:90%; height:auto;\" > Now let's call the fourth test grade x, so...<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=%28a%2Bb%2Bc%2Bx%29%2F4+=+80 ALIGN=MIDDLE  ALT=\"%28a%2Bb%2Bc%2Bx%29%2F4+=+80\"   DISABLED_style= \"max-width:90%; height:auto;\" > This is the desired average of the four test grades. But <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=a%2Bb%2Bc+=+234 ALIGN=MIDDLE  ALT=\"a%2Bb%2Bc+=+234\"   DISABLED_style= \"max-width:90%; height:auto;\" > so substitute:<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=%28234%2Bx%29%2F4+=+80 ALIGN=MIDDLE  ALT=\"%28234%2Bx%29%2F4+=+80\"   DISABLED_style= \"max-width:90%; height:auto;\" > Multiply both sides by 4.<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=234%2Bx+=+320 ALIGN=MIDDLE  ALT=\"234%2Bx+=+320\"   DISABLED_style= \"max-width:90%; height:auto;\" > Subtract 234 from both sides.<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=highlight%28x+=+86%29 ALIGN=MIDDLE  ALT=\"highlight%28x+=+86%29\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "You will need to make a grade of 86 on the fourth test to obtain a final average of 80. </SPAN>\n" );
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