document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=640731>Question 640731</A>: <I><SPAN STYLE=\"word-break: break-all;\"> A certain metal is 20% tin. How many kilograms of this metal must be mixed with 80 kilograms of a metal that is 70% tin to get a metal that is 50% tin? </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #403386 by </B><A HREF=/tutors/aboutme.mpl?userid=sachi><B>sachi(548)</B></A><img src=\"/images/stars/stars-10.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=sachi><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=sachi><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=403386\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> let x kg of 20% mixed with 80 kg of 70% to get 50%<BR>\n" );
document.write( "so x*20%+80*70%=(x+80)*50%<BR>\n" );
document.write( "or 20x+5600=50x+4000<BR>\n" );
document.write( "or 30x=1600<BR>\n" );
document.write( "or x=1600/30=53.33 kg<BR>\n" );
document.write( "ans<BR>\n" );
document.write( " </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );