document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=113457>Question 113457</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Jim wants to buy cement to anchor two posts for a swing he is building.  He has dug 2 round holes that 12 inches in diameter and 40 inches deep.  He wants to fill each with concrete around a rectangular supporting beam that is 3.5 inches by 5.5 inches.  Each 80-pound bag of concrete mixes with water to make 0.6 cubic fee of concrete.  How many bags of concrete must he buy for the job?\r<BR>\n" );
document.write( "<BR>\n" );
document.write( "\n" );
document.write( "if you would explain how you got the answer to this question that would be awesome. thanks! </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #82537 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=82537\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> Jim wants to buy cement to anchor two posts for a swing he is building. He has dug 2 round holes that 12 inches in diameter and 40 inches deep. He wants to fill each with concrete around a rectangular supporting beam that is 3.5 inches by 5.5 inches. Each 80-pound bag of concrete mixes with water to make 0.6 cubic fee of concrete. How many bags of concrete must he buy for the job? <BR>\n" );
document.write( "---------------------<BR>\n" );
document.write( "Volume of the post: 3.5*5.5*40 = 770 cu. in.<BR>\n" );
document.write( "Volume of the holes: 2*(pi)6^2*40 = 9047.786842 cu. in<BR>\n" );
document.write( "-----------------------<BR>\n" );
document.write( "Volume he needs to fill with concrete:<BR>\n" );
document.write( "9047.786842-770 = 8277.786842 cu. in<BR>\n" );
document.write( "-----------------------<BR>\n" );
document.write( "1 cu. ft of of concrete = 12*12*12 = 1728 cu. in.<BR>\n" );
document.write( "0.6 cu. ft. = 0.6*1728 = 1036.8 cu. in.<BR>\n" );
document.write( "-----------------------------<BR>\n" );
document.write( "# of bags = 8277.786842/1036.8 = 7.98 bags<BR>\n" );
document.write( "-----------------------------<BR>\n" );
document.write( "He needs to buy 8 bags.<BR>\n" );
document.write( "=============<BR>\n" );
document.write( "Cheers,<BR>\n" );
document.write( "Stan H. </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );