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Hi Debbie, According to Wikipedia, acre is 43,560 square feet. So, if you dig 1 foot deep over an acre, you get 43,560 cubic feet of dirt. If you dig 5 feet deep, then you have 5 times this amount of dirt. If you dig 5 feet of dirt out of 50 acres, then you have 50 times as much dirt as if you did that over 1 acre. To price the service, it depends if you paying someone else or if you are charging (or just calculating how much it will cost to do it yourself). In the first case, you can ask for a quote based on the volume of dirt in cubic feet (or cubic yards or cubic metres) that needs to be moved. If you are moving he dirt, it depends on how much dirt will fit in the truck / trailer, how much in gas it costs to operate the truck for as long as necessary, whether you have to pay the driver, plus an amount for wear and tear on the vehicles. And there are probably other costs that you can think of that I don't know about. For example, there might be a tipping fee for dropping the dirt off at its destination. Hope this helps. Victoria  


Math Central is supported by the University of Regina and The Pacific Institute for the Mathematical Sciences. 