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You need 1.16tonne.

You need to know the weight of a bag of concrete and then divide 1.16 by that weight and that will give you the answer you need.

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Q: How many bags of concrete is required to fill an area of 12 ft by 8 ft by 3 inches thick?
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Related questions

How many yards of concrete would it take to cover a 16 ' X 14' area 4 inches thick?

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How many square feet will a meter of concrete cover at 3 inches thick?

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