document.write( "Question 159137: A trench is 180 feet long and 12 feet deep,7 feet wide at the top and 4 feet at the bottom.How many cubic yards of earth have been removed? \n" ); document.write( "
Algebra.Com's Answer #117265 by checkley77(12844)\"\" \"About 
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180*12*(7+4)/2=2,160*11/2=11,880 cubic feet of earth.
\n" ); document.write( "11,880/27=40 cubic yards of earth.
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