document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=1012920>Question 1012920</A>: <I><SPAN STYLE=\"word-break: break-all;\"> mark's average score after x scores is 80%. He calculate he will have an 83% if he scores 98% on the next test. How many tests has mark attempted so far? </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #629041 by </B><A HREF=/tutors/aboutme.mpl?userid=Boreal><B>Boreal(15235)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=Boreal><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=Boreal><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=629041\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> Average =total/n<BR>\n" );
document.write( "80=total/n<BR>\n" );
document.write( "83=(total+98)/(n+1)<BR>\n" );
document.write( "80n=total<BR>\n" );
document.write( "83n+83-98=total=83n-15<BR>\n" );
document.write( "Therefore, 80n=83n-15<BR>\n" );
document.write( "-3n=-15<BR>\n" );
document.write( "n=5<BR>\n" );
document.write( "He has taken 5 tests so far,and total score is 400 for an average of 80<BR>\n" );
document.write( "with 6 tests,the total will be 498, and the average is 83. </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );