document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=911396>Question 911396</A>: <I><SPAN STYLE=\"word-break: break-all;\"> A custodian is going to mix a 4% ammonia solution and a 12% ammonia solution to get 1 gallon (128 fluid ounces) of a 9% ammonia solution. How many fluid ounces of the 4% solution and the 12% 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 #553076 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=553076\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> We need a total of 128 oz. at 9%<BR>\n" );
document.write( "We want to know how many oz. at 4% to mix with 12%<BR>\n" );
document.write( "a+b=128,<BR>\n" );
document.write( "0.04*a+0.12*b=0.09*128<BR>\n" );
document.write( "a=128-b<BR>\n" );
document.write( "0.04*(128-b)+0.12*b=11.52<BR>\n" );
document.write( "5.12-0.04b+0.12*b=11.52<BR>\n" );
document.write( "0.08*b=6.4<BR>\n" );
document.write( "b=80<BR>\n" );
document.write( "a=128-b<BR>\n" );
document.write( "a=48 oz. at 4%<BR>\n" );
document.write( "b=80 oz. at 12%<BR>\n" );
document.write( "check<BR>\n" );
document.write( "0.04*48+0.12*80=0.09*128<BR>\n" );
document.write( "1.92+9.6=11.52<BR>\n" );
document.write( "11.52=11.52<BR>\n" );
document.write( "ok<BR>\n" );
document.write( "codemx1<BR>\n" );
document.write( " </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );