1. 1  possible duplicate of Convert decimal number to octal in Lisp â sds Nov 10 '13 at 17:28. 2  @sds Not a duplicate; the one you refer to is about a wrong use of the T symbol and does not have the reverse problem. 3  Wow, thank you very much. 4  When you use truncate and mod, you get the digits in reverse order (4 4 1).
The estimation of 1 cubic foot weighing 40 pounds is based on bags of topsoil. Some bags state a weight of 40 pounds, and some state a volume of 1 cubic foot. The dimensions of the contents are similar. Other factors determining weight are moisture content and volume of sticks, rocks and other debris.
The average weight of a sandstone boulder is approximately 150 pounds per cubic foot. Limestone boulders and granite boulders in most cases weigh more. They average about 175 pounds per cubic foot. To estimate the quantity, you need to convert the area into cubic feet by multiplying length x width x height. Once you have this number, multiply it by the boulder's weight per cubic foot, then divide by 2000 to convert this number into tons.