document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=911585>Question 911585</A>: <I><SPAN STYLE=\"word-break: break-all;\"> A chemist needs 90 milliliters of a 20% solution but only has only 4% and 40% solutions available. Find how many milliliters of each that should be mixed to get the desired solution. </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #553198 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=553198\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> We need a total of 90 mL at 20%<BR>\n" );
document.write( "We want to know how many mL at 4% to mix with 40%<BR>\n" );
document.write( "a+b=90,<BR>\n" );
document.write( "0.04*a+0.4*b=0.2*90<BR>\n" );
document.write( "a=90-b<BR>\n" );
document.write( "0.04*(90-b)+0.4*b=18<BR>\n" );
document.write( "3.6-0.04b+0.4*b=18<BR>\n" );
document.write( "0.36*b=14.4<BR>\n" );
document.write( "b=40<BR>\n" );
document.write( "a=90-b<BR>\n" );
document.write( "a=50 mL at 4%<BR>\n" );
document.write( "b=40 mL at 40%<BR>\n" );
document.write( "check<BR>\n" );
document.write( "0.04*50+0.4*40=0.2*90<BR>\n" );
document.write( "2+16=18<BR>\n" );
document.write( "18=18<BR>\n" );
document.write( "ok<BR>\n" );
document.write( "codemx1<BR>\n" );
document.write( " </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );