document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=651004>Question 651004</A>: <I><SPAN STYLE=\"word-break: break-all;\">  	<BR>\n" );
document.write( "A certain metal is 40% copper. How many kilograms of this metal must be mixed with 60 kilograms of a metal that is 70% copper to get a metal that is 50% copper? </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #407529 by </B><A HREF=/tutors/aboutme.mpl?userid=lwsshak3><B>lwsshak3(11628)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=lwsshak3><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=407529\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> A certain metal is 40% copper. How many kilograms of this metal must be mixed with 60 kilograms of a metal that is 70% copper to get a metal that is 50% copper?<BR>\n" );
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document.write( "let x=kg of 40% copper to be mixed<BR>\n" );
document.write( "x+60=kg of 50% mixture<BR>\n" );
document.write( "..<BR>\n" );
document.write( "40%x+70%*60=50%(x+60)<BR>\n" );
document.write( ".4x+42=.5x+30<BR>\n" );
document.write( ".1x=12<BR>\n" );
document.write( "x=120<BR>\n" );
document.write( "kg of 40% copper to be mixed=120 </SPAN>\n" );
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