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This question cannot directly be answered without having some kind of an idea for the volume of 40 pounds of the topsoil you intend to use (also known as its density). There are huge differences between eg. peat and sand, both which can reasonably be called "topsoil".

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Q: How many 40 pound bags of top soil do you need to fill an area 12' by 6' 4 inches deep?
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