document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=263757>Question 263757</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Translate the problem into a pair of linear equations in two variables.Solve the equations using either elimination or substitution.\r<BR>\n" );
document.write( "\n" );
document.write( "Problem:<BR>\n" );
document.write( "A contractor mixes concrete from bags of pre-mix for small jobs. How many bags with 7% cement should he mix with 10 bags of 15.5% cement to produce a mix containing 12% cement?  </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #194352 by </B><A HREF=/tutors/aboutme.mpl?userid=mananth><B>mananth(16946)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=mananth><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=mananth><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=194352\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> Translate the problem into a pair of linear equations in two variables.Solve the equations using either elimination or substitution.\r<BR>\n" );
document.write( "\n" );
document.write( "Problem:<BR>\n" );
document.write( "A contractor mixes concrete from bags of pre-mix for small jobs. How many bags with 7% cement should he mix with 10 bags of 15.5% cement to produce a mix containing 12% cement? \r<BR>\n" );
document.write( "\n" );
document.write( "let the total no of bags be x\r<BR>\n" );
document.write( "\n" );
document.write( "then x-10 will be number of bags with 7% cement\r<BR>\n" );
document.write( "\n" );
document.write( "x-10*0.07+0.155*10= x*0.12\r<BR>\n" );
document.write( "\n" );
document.write( "0.07x- 0.7+1.55=0.12x<BR>\n" );
document.write( "-0.05x =-0.85<BR>\n" );
document.write( "x= 17 bags\r<BR>\n" );
document.write( "\n" );
document.write( "7 bags of 7% cement will have to be mixed\r<BR>\n" );
document.write( "\n" );
document.write( " </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );