document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=688822>Question 688822</A>: <I><SPAN STYLE=\"word-break: break-all;\"> How many gallons of a 30% acid solution must be mixed with 20 gallons of a 19% solution to obtain a solution that is 25% acid?  </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #425703 by </B><A HREF=/tutors/aboutme.mpl?userid=ptaylor><B>ptaylor(2198)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=ptaylor><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=ptaylor><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=425703\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> Let x=amount of 30% solution needed\r<BR>\n" );
document.write( "\n" );
document.write( "Now we know that the amount of pure acid that exists before the mixture takes place (0.30x+0.19*20) has to equal the amount of pure acid that exists after the mixture takes place(0.25(20+x)). Sooooooo<BR>\n" );
document.write( "0.30x+0.19*20=0.25(20+x)<BR>\n" );
document.write( "0.30x+3.8=5+0.25x subtract 0.25x and also 3.8 from each side<BR>\n" );
document.write( "0.05x=1.2<BR>\n" );
document.write( "x=24 gal---amount of 30% acid solution needed<BR>\n" );
document.write( "CK<BR>\n" );
document.write( "0.30*24+3.8=0.25*44<BR>\n" );
document.write( "7.2+3.8=11<BR>\n" );
document.write( "11=11\r<BR>\n" );
document.write( "\n" );
document.write( "Hope this helps----ptaylor </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );