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21
are these concrete blocks and allowing for mortar. 12.5 per square metre, 62.5 per cubic metre with mortar
11 bags
1.09 cu yards is 29.43 cubic feet and sands weighs 100 pounds per cu ft so you need 2943 pounds. Dide by 50 pounds per bag that is 59 bags
Well, darling, if you want a concrete slab that's 5 inches thick, you'll need about 0.012 cubic meters of cement and 0.06 cubic meters of sand per square meter. Just make sure you mix it well and pour it like a boss. Good luck with your project, sugar!