document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=257791>Question 257791</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Sally wants to know how much water to add to a 40 ml of 70% acid to make a concentration of 50% acid.  </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #189693 by </B><A HREF=/tutors/aboutme.mpl?userid=stanbon><B>stanbon(75887)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=stanbon><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/images/nopicture.jpg><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=189693\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> Sally wants to know how much water to add to a 40 ml of 70% acid to make a concentration of 50% acid. <BR>\n" );
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document.write( "Equation:<BR>\n" );
document.write( "acid + acid = acid<BR>\n" );
document.write( "0.70*40 + 0*x = 0.50(x+40)<BR>\n" );
document.write( "Multiply thru by 100 to get:<BR>\n" );
document.write( "70*40 + 0 = 40x + 50*40<BR>\n" );
document.write( "40x = 20*40<BR>\n" );
document.write( "x = 20 ml (amount of water to add)<BR>\n" );
document.write( "=======================================<BR>\n" );
document.write( "Cheers,<BR>\n" );
document.write( "Stan H. </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );