document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=402617>Question 402617</A>: <I><SPAN STYLE=\"word-break: break-all;\"> A given alloy contains 10% zinc and 20% copper. How many pounds of zinc and copper must be melted with 1000 pounds of the given alloy to produce another alloy analyzing 20% zinc and 24% copper? All percentages are by weight  </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #284785 by </B><A HREF=/tutors/aboutme.mpl?userid=robertb><B>robertb(5830)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=robertb><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=robertb><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=284785\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> 1.00z + 0.10*1000 + 0.00c = 0.20(z + 1000 + c)<BR>\n" );
document.write( "<==> z + 100  = 0.20z + 200 + 0.20c<BR>\n" );
document.write( "<==> 0.80z - 0.20c = 100 <---(A)<BR>\n" );
document.write( "==> 4z - c = 500 ==> c = 4z - 500\r<BR>\n" );
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document.write( "Similarly<BR>\n" );
document.write( "0.00z + 0.20*1000 + 1.00c = 0.24(z + 1000 + c)<BR>\n" );
document.write( "<==> 200 + c = 0.24z + 240 + 0.24c<BR>\n" );
document.write( "<==> -0.24z + 0.76c = 40 <---(B)<BR>\n" );
document.write( "==> -0.24z + 0.76(4z - 500) = 40<BR>\n" );
document.write( "==> -0.24z + 3.04z - 380 = 40<BR>\n" );
document.write( "==> 2.8z = 420<BR>\n" );
document.write( "==> z = 150 lbs zinc, and <BR>\n" );
document.write( "==> c = 4*150 - 500 = 100 lbs copper. </SPAN>\n" );
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