volume of 1 cement bag is 0.035cu.m.
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It depends upon the volume of the bulk bag and how deep you want it covered. Divide the cubic meters in the bulk bag by the depth in meters to get your answer. For example, a bulk bag of 2 cubic meters will cover to a depth of 1 cm. 2 cubic meters / 0.01 meters depth = 200 square meters.
To properly answer this question, one would need to know the volume of a "bag", since "bag" isn't any standard of volume or weight. Typical Portland Cement has a density to 1505kg / cubic meter. In addition, one would also need to know the coarseness of the gravel, as the ability of the sand and cement to fill in the aggregate depends heavily on the average size of the gravel pieces.
Depends how big the bag is
One cubic meter of concrete is equal to 1.308 cubic yards of concrete. If there are 5 1/2 bags of cement in 1 cubic yard of concrete, there would be 7.2 bags in 1 cubic meter of concrete. These are the 94 pound bags of portland cement or roughly 40kg bags so figure 8 bags total. Some will be left over
It would depend on how big the bag of cement is. 1 foot bags will be more in the cubic meter than 2 feet.