document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=49548>Question 49548</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Dearest tutors, can you help me regarding my problem? thank you for that..<BR>\n" );
document.write( "4. A 30-kilogram bag of cement mix contains 25% and 75% sand. How much pure cement must be added to produce a cement mix that is 40% cement? </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #32889 by </B><A HREF=/tutors/aboutme.mpl?userid=stanbon><B>stanbon(75887)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=stanbon><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/images/nopicture.jpg><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=32889\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> A 30-kilogram bag of cement mix contains 25% and 75% sand. How much pure cement must be added to produce a cement mix that is 40% cement?<BR>\n" );
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document.write( "Start: <BR>\n" );
document.write( "Amount = 30 kg ; amount of cement= 0.25(30)= 7.5 kg <BR>\n" );
document.write( "Add:<BR>\n" );
document.write( "Amount = x kg ; amount of cement= 100%x = x kg<BR>\n" );
document.write( "End up With:<BR>\n" );
document.write( "Amount = (30+x) kg amount of cement= 0.40(30+x)= (12+0.4x) kg<BR>\n" );
document.write( "EQUATION:<BR>\n" );
document.write( "cement + cement = cement<BR>\n" );
document.write( "7.5 + x = 12+0.4x<BR>\n" );
document.write( "75 + 10x = 120 + 4x<BR>\n" );
document.write( "6x=45<BR>\n" );
document.write( "x= 7.5 kg ( amount of pure cement that must be added)\r<BR>\n" );
document.write( "\n" );
document.write( "Cheers,<BR>\n" );
document.write( "Stan H. </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );