document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=1069197>Question 1069197</A>: <I><SPAN STYLE=\"word-break: break-all;\"> A certain brass alloy contains 35% zinc and 3.0% lead .<BR>\n" );
document.write( "Then x kg of zinc and y kg of lead are added to 240 kg of the original alloy to make a new alloy that is 40% zinc and 4.0% lead.<BR>\n" );
document.write( "(a) Show that the amount of zinc is given by<BR>\n" );
document.write( "0.35(240) + x = 0.40(240 + x + y)<BR>\n" );
document.write( "and that the amount of lead is given by<BR>\n" );
document.write( "0.03(240) + y = 0.04(240 + x + y)<BR>\n" );
document.write( "(b) Solve for x and y.<BR>\n" );
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document.write( "Do not round intermediate results. Round only final answers. Round to two decimal places. </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #684401 by </B><A HREF=/tutors/aboutme.mpl?userid=josgarithmetic><B>josgarithmetic(39630)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=josgarithmetic><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=684401\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> This is just to get you started.<BR>\n" );
document.write( "For the zinc, total new mass will become  x+y+240 kg.<BR>\n" );
document.write( "Amount of zinc in the new alloy is  0.35*240+x, and concentration wanted is  40%, or 0.4.\r<BR>\n" );
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document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=%280.35%2A240%2Bx%29%2F%28x%2By%2B240%29=0.40 ALIGN=MIDDLE  ALT=\"%280.35%2A240%2Bx%29%2F%28x%2By%2B240%29=0.40\"   DISABLED_style= \"max-width:90%; height:auto;\" >, using decimal fractions instead of percents.\r<BR>\n" );
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document.write( "Multiply left and right by  <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=x%2By%2B240 ALIGN=MIDDLE  ALT=\"x%2By%2B240\"   DISABLED_style= \"max-width:90%; height:auto;\" >:\r<BR>\n" );
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document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=0.35%2A240%2Bx=0.40%28x%2By%2B240%29 ALIGN=MIDDLE  ALT=\"0.35%2A240%2Bx=0.40%28x%2By%2B240%29\"   DISABLED_style= \"max-width:90%; height:auto;\" >\r<BR>\n" );
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document.write( "Now just do the same thing for the lead.\r<BR>\n" );
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document.write( "Once you have the two equations, simplify them and solve the system for x and y.\r<BR>\n" );
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document.write( "Simplified system to solve can become  <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=system%283x-2y=60%2C-x%2B24y=60%29 ALIGN=MIDDLE  ALT=\"system%283x-2y=60%2C-x%2B24y=60%29\"   DISABLED_style= \"max-width:90%; height:auto;\" >.\r<BR>\n" );
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document.write( "RESULTS:<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=system%28x=22%262%2F7%2Cy=3%264%2F7%29 ALIGN=MIDDLE  ALT=\"system%28x=22%262%2F7%2Cy=3%264%2F7%29\"   DISABLED_style= \"max-width:90%; height:auto;\" > </SPAN>\n" );
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