document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=768499>Question 768499</A>: <I><SPAN STYLE=\"word-break: break-all;\"> A flask contains 500 ml of an 80% alcohol solution in water. How much of this solution must be drawn off and replaced by water to obtain a solution having a concentration of 25% alcohol?\r<BR>\n" );
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document.write( "what are the steps to solve this problem? i get confused when there are already situations where you have to replace and to draw off things in the problem. Thankyou :)  </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #468364 by </B><A HREF=/tutors/aboutme.mpl?userid=josgarithmetic><B>josgarithmetic(39618)</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=468364\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> This calculation will be simpler than if you were replacing the solution with a different concentration of alcohol solution.<BR>\n" );
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document.write( "You begin with a liquid of 500 ml. volume, and you finish with a liquid of 500 ml. volume.  When you perform the replacement with the water, you are adding NO alcohol.  \r<BR>\n" );
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document.write( "Let v = volume in milliliters to remove, before replacing with the v of water.<BR>\n" );
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document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=highlight%28%28500%2A%280.8%29-v%280.8%29%2Bv%2A%280%29%29%2F500=0.25%29 ALIGN=MIDDLE  ALT=\"highlight%28%28500%2A%280.8%29-v%280.8%29%2Bv%2A%280%29%29%2F500=0.25%29\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "This is using decimal fractions, being my attempt to make this seem less confusing (maybe it works, maybe not).  <BR>\n" );
document.write( "The equation is in this case, perfectly equivalent to<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=highlight%28%28500%2A%280.8%29-v%280.8%29%29%2F500=0.25%29 ALIGN=MIDDLE  ALT=\"highlight%28%28500%2A%280.8%29-v%280.8%29%29%2F500=0.25%29\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "or if desired, equivalent to <BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=highlight%28%280.8%28500-v%29%29%2F500=0.25%29 ALIGN=MIDDLE  ALT=\"highlight%28%280.8%28500-v%29%29%2F500=0.25%29\"   DISABLED_style= \"max-width:90%; height:auto;\" >\r<BR>\n" );
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document.write( "SOLVE FOR v.\r<BR>\n" );
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document.write( "Do the arithmetic and find v = 343.75 ml. but in practice it should really be 343 or 344. </SPAN>\n" );
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