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It's not clear whether the 6 in the question is 6 inches or 6 feet.

If it's 6 inches: (20 x 20 x 1/2 foot) = 200 cubic feet = 7.41 cubic yards

If it's 6 feet: (20 x 20 x 6) = 2,400 cubic feet = 88.9 cubic yards

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Q: How muck topsoil needed to fill an area of 20' x 20 x 6 dept?
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