document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=1200677>Question 1200677</A>: <I><SPAN STYLE=\"word-break: break-all;\"> How much water must be evaporated from 180 L of 72% brine solution in order to increase the solution’s concentration by 8%?<BR>\n" );
document.write( "	A. 12 L<BR>\n" );
document.write( "	B. 16 L<BR>\n" );
document.write( "	C. 18 L<BR>\n" );
document.write( "	D. 20 L </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #835022 by </B><A HREF=/tutors/aboutme.mpl?userid=math_tutor2020><B>math_tutor2020(3817)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=math_tutor2020><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=835022\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> <font color=black size=3><BR>\n" );
document.write( "x = amount of water to evaporate<BR>\n" );
document.write( "amount is in liters\r<BR>\n" );
document.write( "<BR>\n" );
document.write( "\n" );
document.write( "72% of 180 = 0.72*180 = 129.6 = amount of pure salt. <BR>\n" );
document.write( "This amount stays the same no matter how much water evaporates (since salt isn't carried into the air by the water particles).\r<BR>\n" );
document.write( "<BR>\n" );
document.write( "\n" );
document.write( "A = 129.6 = amount of salt left after evaporation<BR>\n" );
document.write( "B = 180-x = amount of solution left after evaporation<BR>\n" );
document.write( "A/B = concentration of salt after evaporation<BR>\n" );
document.write( "A/B = (129.6)/(180-x) <BR>\n" );
document.write( "A/B = 0.80\r<BR>\n" );
document.write( "<BR>\n" );
document.write( "\n" );
document.write( "(129.6)/(180-x) = 0.80<BR>\n" );
document.write( "129.6 = (180-x)0.80<BR>\n" );
document.write( "129.6 = 0.80(180-x)<BR>\n" );
document.write( "129.6 = 0.80(180)+0.80(-x)<BR>\n" );
document.write( "129.6 = 144-0.80x<BR>\n" );
document.write( "129.6+0.80x = 144<BR>\n" );
document.write( "0.80x = 144-129.6<BR>\n" );
document.write( "0.80x = 14.4<BR>\n" );
document.write( "x = (14.4)/(0.80)<BR>\n" );
document.write( "x = <font color=red>18</font>\r<BR>\n" );
document.write( "<BR>\n" );
document.write( "\n" );
document.write( "Check:<BR>\n" );
document.write( "(129.6)/(180-x) = 0.80<BR>\n" );
document.write( "(129.6)/(180-18) = 0.80<BR>\n" );
document.write( "(129.6)/(162) = 0.80<BR>\n" );
document.write( "0.80 = 0.80<BR>\n" );
document.write( "The answer is confirmed.\r<BR>\n" );
document.write( "<BR>\n" );
document.write( "\n" );
document.write( "Answer:<BR>\n" );
document.write( "<font color=red>18 liters</font> of water must evaporate.<BR>\n" );
document.write( "</font> </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );