document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=1193857>Question 1193857</A>: <I><SPAN STYLE=\"word-break: break-all;\"> A certain mixture for concrete is in the amounts of 1:2:4;\r<BR>\n" );
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document.write( "1 cu. ft. of cement.\r<BR>\n" );
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document.write( "2 cu. ft. of sand.\r<BR>\n" );
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document.write( "4 cu. ft. of gravel / rock.\r<BR>\n" );
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document.write( "Concrete contains spaces or \"voids\" that is filled.\r<BR>\n" );
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document.write( "The 1:2:4 mixture doesn't make 7 cu. ft. of concrete, but less.\r<BR>\n" );
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document.write( "My question:  How is the total calculated ? </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #825905 by </B><A HREF=/tutors/aboutme.mpl?userid=ikleyn><B>ikleyn(52778)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=ikleyn><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=ikleyn><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=825905\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> .\r<BR>\n" );
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document.write( "The volumes of the mixtures are given in the post.\r<BR>\n" );
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document.write( "The components are not a concrete.\r<BR>\n" );
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document.write( "Even the sum of components is not concrete yet.\r<BR>\n" );
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document.write( "To get a concrete, water must added in some proportion and the mixture should be stirred carefully.\r<BR>\n" );
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document.write( "Then some physical and chemical processes take place in the mixture (like baking bread).\r<BR>\n" );
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document.write( "The result of this technological process is concrete.\r<BR>\n" );
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document.write( "Resulting volume of concrete is not equal the sum of volumes of components.\r<BR>\n" );
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document.write( "About physical and chemical processes of getting concrete read and learn from links below\r<BR>\n" );
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document.write( "https://www.britannica.com/technology/concrete-building-material\r<BR>\n" );
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document.write( "https://en.wikipedia.org/wiki/Concrete\r<BR>\n" );
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document.write( "https://www.concretenetwork.com/concrete.html\r<BR>\n" );
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document.write( "For your info: this site/forum is about Math.\r<BR>\n" );
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document.write( "Your question is far from the focus / (subject) of this site/forum.\r<BR>\n" );
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document.write( "The way to estimate the volume of the concrete having given the masses of components and water\r<BR>\n" );
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document.write( "is to divide the total mass of components (including water) by the density of concrete.\r<BR>\n" );
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document.write( " </SPAN>\n" );
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