document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=147290>Question 147290</A>: <I><SPAN STYLE=\"word-break: break-all;\"> A tank holds 80 gallons of chemical solution. Currently the solution has a strength of 30%. How much of this should be drained and replaced with a 70% solution to get a final strength of 40%? </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #107664 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=107664\">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;\" >= amount of 30% solution to be drained and replaced with <BR>\n" );
document.write( "70% solution<BR>\n" );
document.write( "Currently, how much chemical is in the 30% solution?<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=.3%2A80+=+24 ALIGN=MIDDLE  ALT=\".3%2A80+=+24\"   DISABLED_style= \"max-width:90%; height:auto;\" > gallons<BR>\n" );
document.write( "How much chemical will be in the amount drained off?<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=.3x ALIGN=MIDDLE  ALT=\".3x\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "Then how much chemical will be in the solution that is put back in?<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=.7x ALIGN=MIDDLE  ALT=\".7x\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "In words:<BR>\n" );
document.write( "(amount of chemical I end up with) / (amount of solution I end up with) =<BR>\n" );
document.write( "final strength of solution<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=%2824+-+.3x+%2B+.7x%29+%2F+%2880+-+x+%2B+x%29+=+.4 ALIGN=MIDDLE  ALT=\"%2824+-+.3x+%2B+.7x%29+%2F+%2880+-+x+%2B+x%29+=+.4\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=%2824+%2B+.4x%29+%2F+80+=+.4 ALIGN=MIDDLE  ALT=\"%2824+%2B+.4x%29+%2F+80+=+.4\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=24+%2B+.4x+=+.4%2A80 ALIGN=MIDDLE  ALT=\"24+%2B+.4x+=+.4%2A80\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=24+%2B+.4x+=+32 ALIGN=MIDDLE  ALT=\"24+%2B+.4x+=+32\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=.4x+=+8 ALIGN=MIDDLE  ALT=\".4x+=+8\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=x+=+20 ALIGN=MIDDLE  ALT=\"x+=+20\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "20 gallons must be drained off and replaced with 70% solution<BR>\n" );
document.write( "check answer:<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=%2824+%2B+.4x%29+%2F+80+=+.4 ALIGN=MIDDLE  ALT=\"%2824+%2B+.4x%29+%2F+80+=+.4\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=24+%2B+.4%2A20%29+%2F+80+=+.4 ALIGN=MIDDLE  ALT=\"24+%2B+.4%2A20%29+%2F+80+=+.4\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=24+%2B+8%29+%2F+80+=+.4 ALIGN=MIDDLE  ALT=\"24+%2B+8%29+%2F+80+=+.4\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=32%2F80+=+.4 ALIGN=MIDDLE  ALT=\"32%2F80+=+.4\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=32+=+32 ALIGN=MIDDLE  ALT=\"32+=+32\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "OK </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );