document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=911425>Question 911425</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Hector is performing a chemistry experiment that requires 140 mL of a 30% copper sulfate solution. he has a 25% copper sulfate solution and a 60% copper sulfate solution. How many milliliters of each solution Gould he mix to obtain the needed solution? </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #553079 by </B><A HREF=/tutors/aboutme.mpl?userid=richwmiller><B>richwmiller(17219)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=richwmiller><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=richwmiller><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=553079\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> We need a total of 140 mL at 30%<BR>\n" );
document.write( "We want to know how many mL at 25% to mix with 60%<BR>\n" );
document.write( "a+b=140,<BR>\n" );
document.write( "0.25*a+0.6*b=0.3*140<BR>\n" );
document.write( "a=140-b<BR>\n" );
document.write( "0.25*(140-b)+0.6*b=42<BR>\n" );
document.write( "35-0.25b+0.6*b=42<BR>\n" );
document.write( "0.35*b=7<BR>\n" );
document.write( "b=20<BR>\n" );
document.write( "a=140-b<BR>\n" );
document.write( "a=120 mL at 25%<BR>\n" );
document.write( "b=20 mL at 60%<BR>\n" );
document.write( "check<BR>\n" );
document.write( "0.25*120+0.6*20=0.3*140<BR>\n" );
document.write( "30+12=42<BR>\n" );
document.write( "42=42<BR>\n" );
document.write( "ok<BR>\n" );
document.write( "codemx1<BR>\n" );
document.write( " </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );