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How much cement is needed to cover 192 square feet of area
This can vary do to the mixture of sand, stone, cement... but an approximate average would be 3000 lbs
Spread it evenly, then leave your hands in the cement for 4-6 hours to spread excess cement.
How much cement required for grouting of block (16"x8"x8") wall for 100 sft area
That would depend on how thinly you spread it.
It depends on the thickness of slab. A yard of cement contains 9 cubic feet. Thus, it would cover 9 square feet if the slab was 1 foot thick. For a 4 inch thick slab, it would cover 3 times as much area, or 27 square feet.
At 4" deep, 89 sq. ft.
160 cubic inches / (1/8 inches) = 160*8 = 1280 sq inches
1.5 meters
The answer will depends on the size of the bag, how much cement it makes and the thickness of the cement layer. Since you have not bothered to share these crucial bits of information, I cannot provide a more useful answer.
they covered area
it covers about 193