document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=284305>Question 284305</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Two mathematics classes took the same test. The mean of the first class of twenty students was 90%. The mean of the second class was 75%. If the mean grade for the combined classes was 81%, how many students were in the second class?\r<BR>\n" );
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document.write( "(A) 20 (B) 30 (C) 23 (D) 22 (E) 28 </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #206330 by </B><A HREF=/tutors/aboutme.mpl?userid=richwmiller><B>richwmiller(17219)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=richwmiller><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=richwmiller><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=206330\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> f/20=90<BR>\n" );
document.write( "s/y=75<BR>\n" );
document.write( "(f+s)/(20+y)=81<BR>\n" );
document.write( "f = 1800,   s = 2250,   y = 30<BR>\n" );
document.write( "The second class had 30 students<BR>\n" );
document.write( "(B)30<BR>\n" );
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