document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=907529>Question 907529</A>: <I><SPAN STYLE=\"word-break: break-all;\"> A contractor mixes concrete from bags of pre-mix for small jobs. How many bags with 4% cement should he mix with 4 bags of 24% cement to produce a mix containing 9% cement? </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #550427 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=550427\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> We have 4 bags of 24% cement<BR>\n" );
document.write( "We want to add some 4% cement  to make   9% cement<BR>\n" );
document.write( "0.04*x+0.24*4=0.09(4+x)<BR>\n" );
document.write( "0.04*x+0.96=0.36+0.09x<BR>\n" );
document.write( "0.04x-0.09x=0.36-0.96<BR>\n" );
document.write( "-0.05x=-0.6<BR>\n" );
document.write( "x=12 bags at 4% (0.48) is added to 4 bags at 24%(0.96) to make 9% of 16 bags(1.44)<BR>\n" );
document.write( "check<BR>\n" );
document.write( "0.04*12+0.24*4=0.09(4+12)<BR>\n" );
document.write( "0.48+0.96=0.09(16)<BR>\n" );
document.write( "1.44=1.44<BR>\n" );
document.write( "ok<BR>\n" );
document.write( " </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );