document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=831546>Question 831546</A>: <I><SPAN STYLE=\"word-break: break-all;\"> A mechanic is working on a car with a 20-qt radiator containing a 60% antifreeze solution. How much of the solution should he drain and replace with pure water to get a solution that is 50% antifreeze?  </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #501499 by </B><A HREF=/tutors/aboutme.mpl?userid=josmiceli><B>josmiceli(19441)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=josmiceli><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=josmiceli><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=501499\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> Let <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+x+ ALIGN=MIDDLE  ALT=\"+x+\"   DISABLED_style= \"max-width:90%; height:auto;\" > = quarts of solution that musty be drained<BR>\n" );
document.write( "and replaced with pure water<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+.6x+ ALIGN=MIDDLE  ALT=\"+.6x+\"   DISABLED_style= \"max-width:90%; height:auto;\" > = quarts of pure antifreeze in the solution<BR>\n" );
document.write( "that is drained from radiator<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+.6%2A20+=+12+ ALIGN=MIDDLE  ALT=\"+.6%2A20+=+12+\"   DISABLED_style= \"max-width:90%; height:auto;\" > = quarts of pure antifreeze originally<BR>\n" );
document.write( "in the radiator<BR>\n" );
document.write( "-------------------------<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+%28+12+-+.6x+%29+%2F+20+=+.5+ ALIGN=MIDDLE  ALT=\"+%28+12+-+.6x+%29+%2F+20+=+.5+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+12+-+.6x+=+.5%2A20+ ALIGN=MIDDLE  ALT=\"+12+-+.6x+=+.5%2A20+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+12+-+.6x+=+10+ ALIGN=MIDDLE  ALT=\"+12+-+.6x+=+10+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+.6x+=+12+-+10+ ALIGN=MIDDLE  ALT=\"+.6x+=+12+-+10+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+.6x+=+2+ ALIGN=MIDDLE  ALT=\"+.6x+=+2+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+x+=+3.333+ ALIGN=MIDDLE  ALT=\"+x+=+3.333+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "3.333 quarts of the solution should he drained and replaced <BR>\n" );
document.write( "with pure water to get a solution that is 50% antifreeze<BR>\n" );
document.write( "-------------------<BR>\n" );
document.write( "check answer:<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+.6%2A3.333+=+2+ ALIGN=MIDDLE  ALT=\"+.6%2A3.333+=+2+\"   DISABLED_style= \"max-width:90%; height:auto;\" > quarts of pure antifreeze is drained<BR>\n" );
document.write( "There is <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+.6%2A20+-+2+ ALIGN=MIDDLE  ALT=\"+.6%2A20+-+2+\"   DISABLED_style= \"max-width:90%; height:auto;\" > <BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+12+-+2+=+10+ ALIGN=MIDDLE  ALT=\"+12+-+2+=+10+\"   DISABLED_style= \"max-width:90%; height:auto;\" > quarts of pure antifreeze left<BR>\n" );
document.write( "The concentration after the <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=4 ALIGN=MIDDLE  ALT=\"4\"   DISABLED_style= \"max-width:90%; height:auto;\" > quarts of water is<BR>\n" );
document.write( "poured in is:<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+10%2F20+=+.5+ ALIGN=MIDDLE  ALT=\"+10%2F20+=+.5+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+.5%2A100+ ALIGN=MIDDLE  ALT=\"+.5%2A100+\"   DISABLED_style= \"max-width:90%; height:auto;\" > = 50% antifreeze<BR>\n" );
document.write( "OK<BR>\n" );
document.write( " </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );