document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=738729>Question 738729</A>: <I><SPAN STYLE=\"word-break: break-all;\"> How much of a 7% alcohol solution should be mixed with how much of a 15% alcohol solution so that you get 20 gallons of a 12% alcohol solution? </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #450910 by </B><A HREF=/tutors/aboutme.mpl?userid=mathstutor494><B>mathstutor494(120)</B></A><img src=\"/images/stars/stars-09.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=mathstutor494><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=mathstutor494><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=450910\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> Let x be the number of gallons of 15% alcohol<BR>\n" );
document.write( "Therefore <BR>\n" );
document.write( "number of gallons of 7% alcohol = 20-x\r<BR>\n" );
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document.write( "x*0.15+(20-x)*0.07=20*0.12<BR>\n" );
document.write( "0.15x+1.4-0.07x = 2.4<BR>\n" );
document.write( "0.15x-0.07x = 2.4 - 1.4<BR>\n" );
document.write( "0.08x = 1<BR>\n" );
document.write( "x = 1/0.08 = 12.8 Gallons<BR>\n" );
document.write( "Ans : <BR>\n" );
document.write( "12.8 Gallons of 15% alcohol<BR>\n" );
document.write( "7.2 Gallons of 7% alcohol\r<BR>\n" );
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document.write( " </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );