document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=390706>Question 390706</A>: <I><SPAN STYLE=\"word-break: break-all;\"> a shipment of computer monitors, some weighing 25lb and the others weighing 40 lb each, has a total weight of 680 lb. If there are 20 monitors altogether, how many weigh 40 lb? </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #277102 by </B><A HREF=/tutors/aboutme.mpl?userid=checkley79><B>checkley79(3341)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=checkley79><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=277102\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> 25x+40y=680<BR>\n" );
document.write( "x+y=20<BR>\n" );
document.write( "x=20-y<BR>\n" );
document.write( "25(20-y)+40y=680<BR>\n" );
document.write( "500-25y+40y=680<BR>\n" );
document.write( "15y=680-500<BR>\n" );
document.write( "15y=180<BR>\n" );
document.write( "y=180/15<BR>\n" );
document.write( "y=12 40 lb. monitors.<BR>\n" );
document.write( "x+12=20<BR>\n" );
document.write( "x=20-12<BR>\n" );
document.write( "x=8 25 lb. monitors.<BR>\n" );
document.write( "Proof:<BR>\n" );
document.write( "25*8+40*12=680<BR>\n" );
document.write( "200+480=680<BR>\n" );
document.write( "680=680<BR>\n" );
document.write( " </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );