document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=529835>Question 529835</A>: <I><SPAN STYLE=\"word-break: break-all;\"> A tank contains 20 gallons of antifreeze solution.  When it is full, it contains 15% antifreeze.  How many gallons must be replaced by an 80% antifreeze solution to get 20 gallons of a 70% solution? </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #349769 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=349769\">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;\" > = gallons of 15% antifreeze to be<BR>\n" );
document.write( "removed and replaced with 80% antifreeze<BR>\n" );
document.write( "In words:<BR>\n" );
document.write( "( gallons of pure antifreeze at end)/( gallons of solution at end) = 70%<BR>\n" );
document.write( "-------------<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+.15%2A20+=+3+ ALIGN=MIDDLE  ALT=\"+.15%2A20+=+3+\"   DISABLED_style= \"max-width:90%; height:auto;\" > gallons of pure antifreeze at start<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+20+-+x+ ALIGN=MIDDLE  ALT=\"+20+-+x+\"   DISABLED_style= \"max-width:90%; height:auto;\" > gallons of solution left after removal of <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=x ALIGN=MIDDLE  ALT=\"x\"   DISABLED_style= \"max-width:90%; height:auto;\" > gallons<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+.15%2A%28+20+-+x+%29+ ALIGN=MIDDLE  ALT=\"+.15%2A%28+20+-+x+%29+\"   DISABLED_style= \"max-width:90%; height:auto;\" > = pure antifreeze left after removal of <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=x ALIGN=MIDDLE  ALT=\"x\"   DISABLED_style= \"max-width:90%; height:auto;\" > gallons<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+.8x+ ALIGN=MIDDLE  ALT=\"+.8x+\"   DISABLED_style= \"max-width:90%; height:auto;\" > = pure antifreeze in 80% solution added<BR>\n" );
document.write( "The total gallons of solution has not changed<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+%28+.8x+%2B+.15%2A%28+20+-+x+%29+%29+%2F+20+=+.7+ ALIGN=MIDDLE  ALT=\"+%28+.8x+%2B+.15%2A%28+20+-+x+%29+%29+%2F+20+=+.7+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+.8x+%2B+3+-+.15x+=+14+ ALIGN=MIDDLE  ALT=\"+.8x+%2B+3+-+.15x+=+14+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+.65x+=+11+ ALIGN=MIDDLE  ALT=\"+.65x+=+11+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+x+=+16.923+ ALIGN=MIDDLE  ALT=\"+x+=+16.923+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "16.923 gallons must be removed and replace with <BR>\n" );
document.write( "16.923 gallons of 80% antifreeze<BR>\n" );
document.write( "-----------<BR>\n" );
document.write( "check:<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+20+-+16.923+=+3.077+ ALIGN=MIDDLE  ALT=\"+20+-+16.923+=+3.077+\"   DISABLED_style= \"max-width:90%; height:auto;\" > gallons of solution left after removal of <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=x ALIGN=MIDDLE  ALT=\"x\"   DISABLED_style= \"max-width:90%; height:auto;\" > gallons<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+.15%2A%28+20+-+16.923+%29+=+.4615+ ALIGN=MIDDLE  ALT=\"+.15%2A%28+20+-+16.923+%29+=+.4615+\"   DISABLED_style= \"max-width:90%; height:auto;\" > = pure antifreeze left after removal of <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=x ALIGN=MIDDLE  ALT=\"x\"   DISABLED_style= \"max-width:90%; height:auto;\" > gallons<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+.8%2A16.923+=+13.538+ ALIGN=MIDDLE  ALT=\"+.8%2A16.923+=+13.538+\"   DISABLED_style= \"max-width:90%; height:auto;\" > = pure antifreeze in 80% solution added<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+%28+.8x+%2B+.15%2A%28+20+-+x+%29+%29+%2F+20+=+.7+ ALIGN=MIDDLE  ALT=\"+%28+.8x+%2B+.15%2A%28+20+-+x+%29+%29+%2F+20+=+.7+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+%28+13.538+%2B+.4615+%29+%2F+20+=+.7+ ALIGN=MIDDLE  ALT=\"+%28+13.538+%2B+.4615+%29+%2F+20+=+.7+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+13.9995+%2F+20+=+.7+ ALIGN=MIDDLE  ALT=\"+13.9995+%2F+20+=+.7+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+13.9995+=+14+ ALIGN=MIDDLE  ALT=\"+13.9995+=+14+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "error due to rounding off- OK\r<BR>\n" );
document.write( "<BR>\n" );
document.write( "\n" );
document.write( "  </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );