document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=961974>Question 961974</A>: <I><SPAN STYLE=\"word-break: break-all;\"> You have 0.35 liters of an acid solution whose acid concentration is 15%. How many liters of pure water should be added to lower the concentration to 7%?  </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #854560 by </B><A HREF=/tutors/aboutme.mpl?userid=ikleyn><B>ikleyn(53906)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=ikleyn><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=ikleyn><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=854560\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> .<BR>\n" );
document.write( "You have 0.35 liters of an acid solution whose acid concentration is 15%. <BR>\n" );
document.write( "How many liters of pure water should be added to lower the concentration to 7%?<BR>\n" );
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document.write( "&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;@lwsshar3 in his post gives an answer 40.<BR>\n" );
document.write( "&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;40 of what ? Liters ?<BR>\n" );
document.write( "&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;But this is an absurd.\r<BR>\n" );
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document.write( "&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;There is a rude error in calculations by @lwsshar3.<BR>\n" );
document.write( "&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;I came to bring a correct solution.\r<BR>\n" );
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document.write( "let x=amt of pure water should be added (in liters).<BR>\n" );
document.write( "0.15*0.35 = 0.07*(0.35+x)<BR>\n" );
document.write( "0.0525 = 0.0245 + 0.07x<BR>\n" );
document.write( "0.07x = 0.0525 - 0.0245<BR>\n" );
document.write( "0.07x = 0.028<BR>\n" );
document.write( "x = 0.028/0.07 = 0.4.<BR>\n" );
document.write( "How many liters of pure water should be added to lower the concentration to 7%? &nbsp;&nbsp;&nbsp;&nbsp;0.4 of a liter.\r<BR>\n" );
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document.write( "<U>CHECK</U>. &nbsp;&nbsp;&nbsp;&nbsp;The final concentration is &nbsp;&nbsp;<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=%280.35%2A0.15%29%2F%280.35%2B0.4%29 ALIGN=MIDDLE  ALT=\"%280.35%2A0.15%29%2F%280.35%2B0.4%29\"   DISABLED_style= \"max-width:90%; height:auto;\" > = 0.07, &nbsp;&nbsp;or &nbsp;&nbsp;7%. &nbsp;&nbsp;&nbsp;&nbsp;! precisely correct !\r<BR>\n" );
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document.write( "Solved correctly.\r<BR>\n" );
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document.write( "The lesson to learn: when you make calculations, keep the dimensions consistent and be accurate.\r<BR>\n" );
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