document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=911100>Question 911100</A>: <I><SPAN STYLE=\"word-break: break-all;\"> A chemist needs 130 ml of a 31% acid solution, but has only 7% and 46% solutions available. How many ml of the 46% solution should be added 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 #553123 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=553123\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> We need a total of 130 mL at 31%<BR>\n" );
document.write( "We want to know how many mL at 7% to mix with 46%<BR>\n" );
document.write( "a+b=130,<BR>\n" );
document.write( "0.07*a+0.46*b=0.31*130<BR>\n" );
document.write( "a=130-b<BR>\n" );
document.write( "0.07*(130-b)+0.46*b=40.3<BR>\n" );
document.write( "9.1-0.07b+0.46*b=40.3<BR>\n" );
document.write( "0.39*b=31.2<BR>\n" );
document.write( "b=80<BR>\n" );
document.write( "a=130-b<BR>\n" );
document.write( "a=50 mL at 7%<BR>\n" );
document.write( "b=80 mL at 46%<BR>\n" );
document.write( "check<BR>\n" );
document.write( "0.07*50+0.46*80=0.31*130<BR>\n" );
document.write( "3.5+36.8=40.3<BR>\n" );
document.write( "40.3=40.3<BR>\n" );
document.write( "ok<BR>\n" );
document.write( "codemx1<BR>\n" );
document.write( " </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );