document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=622571>Question 622571</A>: <I><SPAN STYLE=\"word-break: break-all;\"> A 45 gallon barrel contains a mixture with a concentration of 30%.  How much of this mixture must be withdrawn and replaced by 100% concentrate to bring the mixture up to 50% concentration? </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #391450 by </B><A HREF=/tutors/aboutme.mpl?userid=lwsshak3><B>lwsshak3(11628)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=lwsshak3><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=391450\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> A 45 gallon barrel contains a mixture with a concentration of 30%. How much of this mixture must be withdrawn and replaced by 100% concentrate to bring the mixture up to 50% concentration?<BR>\n" );
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document.write( "let x=mixture to be withdrawn and replaced<BR>\n" );
document.write( "45-x=remaining 30% mixture<BR>\n" );
document.write( "30%(45-x)+100%x=50%*45<BR>\n" );
document.write( "13.5-.3x+x=22.5<BR>\n" );
document.write( ".7x=9<BR>\n" );
document.write( "x&#8776;12.86<BR>\n" );
document.write( "gallons of mixture to be withdrawn and replaced&#8776;12.86<BR>\n" );
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