document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=910546>Question 910546</A>: <I><SPAN STYLE=\"word-break: break-all;\"> A 6% acidic solution is combined with a 20% acidic solution to produce 21 gallons of a 12% acidic solution. Determine how many gallons of the 6% acidic solution should be used. </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #552543 by </B><A HREF=/tutors/aboutme.mpl?userid=richwmiller><B>richwmiller(17219)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=richwmiller><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=richwmiller><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=552543\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> We need a total of 21 gal at 12%<BR>\n" );
document.write( "We want to know how many gal at 6% to mix with 20%<BR>\n" );
document.write( "a+b=21,<BR>\n" );
document.write( "0.06*a+0.2*b=0.12*21<BR>\n" );
document.write( "a=21-b<BR>\n" );
document.write( "0.06*(21-b)+0.2*b=2.52<BR>\n" );
document.write( "1.26-0.06b+0.2*b=2.52<BR>\n" );
document.write( "0.14*b=1.26<BR>\n" );
document.write( "b=9<BR>\n" );
document.write( "a=21-b<BR>\n" );
document.write( "a=12 gal at 6%<BR>\n" );
document.write( "b=9 gal at 20%<BR>\n" );
document.write( "check<BR>\n" );
document.write( "0.06*12+0.2*9=0.12*21<BR>\n" );
document.write( "0.72+1.8=2.52<BR>\n" );
document.write( "2.52=2.52<BR>\n" );
document.write( "ok<BR>\n" );
document.write( "codemx1<BR>\n" );
document.write( " </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );