blocks of what size
It depends on the size of the concrete blocks
4
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The number of concrete blocks in a cube depends on the size and style of the blocks. For 6-inch by 4-inch by 16-inch blocks, there are generally either 100 or 120 per cube. For blocks that are 8 inches by 8 inches by 16 inches, there are usually either 75 or 90 per cube.
Depends entirely on the size of the individual blocks !
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20
are these concrete blocks and allowing for mortar. 12.5 per square metre, 62.5 per cubic metre with mortar
10.94 bags
The answer will depend on the orientation of the blocks. It will be between 13 and 25.
The number of concrete blocks per square meter depends on the size of the blocks being used. Standard concrete blocks typically measure 400mm x 200mm x 200mm (16" x 8" x 8"). To cover one square meter, you would need approximately 12.5 blocks, assuming no gaps and perfect placement, but it's advisable to account for waste and cutting, which may increase the total needed.
That's going to depend on the shape of the cubic meter, because the drying happens where the concrete is in contact with the air. A slab will dry faster than a cube or a pier.