document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=1164940>Question 1164940</A>: <I><SPAN STYLE=\"word-break: break-all;\"> The gasoline tank of a car contains 50 liters of gasoline and alcohol, the alcohol comprising 25%. How much of the mixture must be drawn off and replaced by alcohol so that the tank contain a mixture of which 50% is alcohol?  </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #789372 by </B><A HREF=/tutors/aboutme.mpl?userid=Boreal><B>Boreal(15235)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=Boreal><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=Boreal><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=789372\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> G+A=50 l<BR>\n" );
document.write( "A=12.5 l<BR>\n" );
document.write( "G=37.5 l<BR>\n" );
document.write( "remove x liters and replace with x alcohol<BR>\n" );
document.write( "each liter that is removed is 0.75 G and 0.25 A\r<BR>\n" );
document.write( "\n" );
document.write( "37.5-0.75x=12.5-0.25x+x=12.5+0.75x<BR>\n" );
document.write( "25=1.5x<BR>\n" );
document.write( "x=16 2/3 l drawn off\r<BR>\n" );
document.write( "\n" );
document.write( "after drawing off, there is 33 1/3 liters in tank and 1/4 is alcohol or 8.33 liters.<BR>\n" );
document.write( "and 16 2/3 liters alcohol to the tank and have 50 liters again and  25 liters of alcohol or 50%\r<BR>\n" );
document.write( "\n" );
document.write( "it is 16 2/3 liters.\r<BR>\n" );
document.write( "\n" );
document.write( " </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );