document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=114919>Question 114919</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Patti needs 8000 litres of a 35% solution of hydrogen chloride. How many litres of a 40% solution and how many litres of a 20% solution will she use?\r<BR>\n" );
document.write( "\n" );
document.write( "1. How many litres of 40% solution & how many solutions of 20% solution?<BR>\n" );
document.write( "2. Litre of 40% = x<BR>\n" );
document.write( "   Litre of 20% = y\r<BR>\n" );
document.write( "\n" );
document.write( "x + y = 8000<BR>\n" );
document.write( ".40x + .20y = .35\r<BR>\n" );
document.write( "\n" );
document.write( "Many thanks for any assistance your able to share.<BR>\n" );
document.write( "pmoss<BR>\n" );
document.write( "From this point on I'm stuck..I don't know how to solve the problem. </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #83632 by </B><A HREF=/tutors/aboutme.mpl?userid=rajagopalan><B>rajagopalan(174)</B></A><img src=\"/images/stars/stars-09.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=rajagopalan><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=rajagopalan><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=83632\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> Note * is used as multiplication symbol as x is used as the variable:<BR>\n" );
document.write( "..<BR>\n" );
document.write( "Let  Litres of 40% = x<BR>\n" );
document.write( "Then Litres of 20% = (8000-x)\r<BR>\n" );
document.write( "\n" );
document.write( "But Total H Cl in 8000 litres of 35% solution = 0.35*8000= 2800 litres\r<BR>\n" );
document.write( "\n" );
document.write( "H Cl in 40% solution =0.4*x<BR>\n" );
document.write( "H Cl in 20% solution =0.2*(8000-x)\r<BR>\n" );
document.write( "\n" );
document.write( "Now our equation is (0.4*x)+(0.2*(8000-x))=2800<BR>\n" );
document.write( "0.4x+(8000-x)0.2=2800<BR>\n" );
document.write( "0.4x-1600-0.2x=2800<BR>\n" );
document.write( "0.2x-1600=2800<BR>\n" );
document.write( "0.2x=2800-1600<BR>\n" );
document.write( "0.2x=1200<BR>\n" );
document.write( "x=1200/0.2=6000\r<BR>\n" );
document.write( "\n" );
document.write( "so   40% solution = 6000 litres<BR>\n" );
document.write( "and  20% solution =2000 litres\r<BR>\n" );
document.write( "\n" );
document.write( "Okay\r<BR>\n" );
document.write( "\n" );
document.write( " </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );