document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=788263>Question 788263</A>: <I><SPAN STYLE=\"word-break: break-all;\"> A 90% acid solution is diluted with water to make a solution of 60% acid. When liters of water is added to dilute it again, the solution becomes 40% acid. How much water is added to the solution on the first instance? How much 90% acid was available at the start?\r<BR>\n" );
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document.write( "thank you very much~! :) </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #478467 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=478467\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> You need more information.  The description is incomplete.\r<BR>\n" );
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document.write( "Let f=how much volume of 90% acid<BR>\n" );
document.write( "Let y=how much water to add to get 60% acid.\r<BR>\n" );
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document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=90%2Af%2F%28y%2Bf%29=60 ALIGN=MIDDLE  ALT=\"90%2Af%2F%28y%2Bf%29=60\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=90f=60%28y%2Bf%29 ALIGN=MIDDLE  ALT=\"90f=60%28y%2Bf%29\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=90f=60y%2B60f ALIGN=MIDDLE  ALT=\"90f=60y%2B60f\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=9f-6f=6y ALIGN=MIDDLE  ALT=\"9f-6f=6y\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=3f=6y ALIGN=MIDDLE  ALT=\"3f=6y\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=highlight%28y=f%2F2%29 ALIGN=MIDDLE  ALT=\"highlight%28y=f%2F2%29\"   DISABLED_style= \"max-width:90%; height:auto;\" > liters of water\r<BR>\n" );
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document.write( "The second dilution now starts with (f+f/2) liters of 60% acid.<BR>\n" );
document.write( "You want now to dilute to 40% acid.<BR>\n" );
document.write( "Let x=volume of water to add for diluting to 40%.\r<BR>\n" );
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document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=60%2A%28f%2Bf%2F2%29%2F%28x%2Bf%2Bf%2F2%29=40 ALIGN=MIDDLE  ALT=\"60%2A%28f%2Bf%2F2%29%2F%28x%2Bf%2Bf%2F2%29=40\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "Solve for x. </SPAN>\n" );
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