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About 10. 16 x 16 = 256. 256 ÷ 12 = 10.666666666.
around twenty kgs
a 16 inch block is 16/12 = 1.33 feet; one block is 1.33 x 1.33 = 1.77 square feet Since the patio is 8 x 8 = 64 sq ft, you need 64/1.77 = 36 blocks You will need extras if coevrage is not even.
6 x 6 : Since 2 pavers are needed for each foot, 12 x 12 patio will require 24 x 24 pavers. 6 x 9 : 2 pavers for each foot along one 12 foot side = 24 The other side will require fewer, 4 for every 3 feet or 16 overall Thus total required will be 24 x 16 pavers. You do the math.