document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=311236>Question 311236</A>: <I><SPAN STYLE=\"word-break: break-all;\"> how much pure alcohol must be added to 15 oz of a 60% solution of rubbing alcohol to change it to a 70% solution? </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #222580 by </B><A HREF=/tutors/aboutme.mpl?userid=mananth><B>mananth(16946)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=mananth><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=mananth><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=222580\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> let quantity of 100% alcohol required be x oz\r<BR>\n" );
document.write( "\n" );
document.write( "rubbing alcohol = 60% 15 oz\r<BR>\n" );
document.write( "\n" );
document.write( "Mixture 70% alcohol quantity = (x+15) oz\r<BR>\n" );
document.write( "\n" );
document.write( "add the concentrations of individual and equate it to total concentration<BR>\n" );
document.write( ".<BR>\n" );
document.write( "1x+0.6*15 =0.7(x+15)\r<BR>\n" );
document.write( "\n" );
document.write( "x+9=0.7x +10.5\r<BR>\n" );
document.write( "\n" );
document.write( "x-0.7x = 10.5-9<BR>\n" );
document.write( "0.3x = 1.5<BR>\n" );
document.write( "x=5 oz of pure alcohol </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );