document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=227659>Question 227659</A>: <I><SPAN STYLE=\"word-break: break-all;\"> How much pure antifreeze should be added to a gallon of 70% antifreeze solution to make a 90% antifreeze solution? </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #169098 by </B><A HREF=/tutors/aboutme.mpl?userid=nerdybill><B>nerdybill(7384)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=nerdybill><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=nerdybill><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=169098\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\">     How much pure antifreeze should be added to a gallon of 70% antifreeze solution to make a 90% antifreeze solution?<BR>\n" );
document.write( ".<BR>\n" );
document.write( "Let x = amount of pure antifreeze added<BR>\n" );
document.write( "then<BR>\n" );
document.write( "x + .70(1) = .90(x+1)<BR>\n" );
document.write( "x + .70 = .90x+.90<BR>\n" );
document.write( ".10x + .70 = .90<BR>\n" );
document.write( ".10x = .20<BR>\n" );
document.write( "x = .20/.10<BR>\n" );
document.write( "x = 2 gallons<BR>\n" );
document.write( " </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );