document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=924476>Question 924476</A>: <I><SPAN STYLE=\"word-break: break-all;\"> 25 students in class A did a science exam.<BR>\n" );
document.write( "30 students in class B did the same science exam. <BR>\n" );
document.write( "The mean mark for the 25 students in class A is 67.8<BR>\n" );
document.write( "The mean mark for all the 55 students is 72.0\r<BR>\n" );
document.write( "\n" );
document.write( "Work out the mean mark for the students in class B.\r<BR>\n" );
document.write( "\n" );
document.write( "Please help :) </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #560865 by </B><A HREF=/tutors/aboutme.mpl?userid=TimothyLamb><B>TimothyLamb(4379)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=TimothyLamb><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=TimothyLamb><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=560865\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> x = sum of scores for class A<BR>\n" );
document.write( "y = sum of scores for class B<BR>\n" );
document.write( "---<BR>\n" );
document.write( "x/25 = 67.8<BR>\n" );
document.write( "(x + y)/55 = 72.0<BR>\n" );
document.write( "---<BR>\n" );
document.write( "x = 67.8*25<BR>\n" );
document.write( "x + y = 72.0*55<BR>\n" );
document.write( "---<BR>\n" );
document.write( "x = 1695<BR>\n" );
document.write( "x + y = 3960<BR>\n" );
document.write( "---<BR>\n" );
document.write( "x = 1695<BR>\n" );
document.write( "y = 3960 - x<BR>\n" );
document.write( "y = 3960 - 1695<BR>\n" );
document.write( "y = 2265<BR>\n" );
document.write( "---<BR>\n" );
document.write( "y/30 = ?<BR>\n" );
document.write( "2265/30 = ?<BR>\n" );
document.write( "2265/30 = 75.5<BR>\n" );
document.write( "---<BR>\n" );
document.write( "answer:<BR>\n" );
document.write( "mean mark for the students in class B = 75.5<BR>\n" );
document.write( "---<BR>\n" );
document.write( "check:<BR>\n" );
document.write( "(1695 + 2265)/55 = 72<BR>\n" );
document.write( "---<BR>\n" );
document.write( "Solve and graph linear equations:<BR>\n" );
document.write( "https://sooeet.com/math/linear-equation-solver.php<BR>\n" );
document.write( "---<BR>\n" );
document.write( "Solve quadratic equations, quadratic formula:<BR>\n" );
document.write( "https://sooeet.com/math/quadratic-formula-solver.php<BR>\n" );
document.write( "---<BR>\n" );
document.write( "Convert fractions, decimals, and percents:<BR>\n" );
document.write( "https://sooeet.com/math/fraction-decimal-percent.php<BR>\n" );
document.write( "---<BR>\n" );
document.write( "Calculate and graph the linear regression of any data set:<BR>\n" );
document.write( "https://sooeet.com/math/linear-regression.php </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );