document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=564653>Question 564653</A>: <I><SPAN STYLE=\"word-break: break-all;\"> A chemist has 500L of a 15% acid solution. How much pure acid should be added to make a 20% acid solution? <BR>\n" );
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document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #365447 by </B><A HREF=/tutors/aboutme.mpl?userid=Maths68><B>Maths68(1474)</B></A><img src=\"/images/stars/stars-12.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=Maths68><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=Maths68><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=365447\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> Solution A<BR>\n" );
document.write( "Amount = 500 liters <BR>\n" );
document.write( "Concentration =15% =0.15\r<BR>\n" );
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document.write( "Solution B<BR>\n" );
document.write( "Amount = x <BR>\n" );
document.write( "Concentration =100% = 1\r<BR>\n" );
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document.write( "Resultant Solution<BR>\n" );
document.write( "Amount =500+x <BR>\n" );
document.write( "Concentration =20%=0.2\r<BR>\n" );
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document.write( "[Amount Solution A * Concentration A] + [Amount Solution B * Concentration of B] = Amount of Resultant * Concentration of resultant\r<BR>\n" );
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document.write( "(500)(0.15)+(x)(1)=(500+x)(.02)<BR>\n" );
document.write( "75+1x=100+0.2x<BR>\n" );
document.write( "1x-0.2x=100-75<BR>\n" );
document.write( "0.8x=25<BR>\n" );
document.write( "0.8x/0.8=25/8<BR>\n" );
document.write( "x=20\r<BR>\n" );
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document.write( "He should add 20 liters of pure acide to make a 20% acid solution?<BR>\n" );
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