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Each slab is .5 x .5 = .25 square m. Yard is 8x 5 = 40 square m so you need 40/.25 = 160 slabs
Area of paving slab = 0.3 m * 0.3 m = 0.09 sq metres. So number of slabs required = 22/0.09 = 244.44.. recurring = 245. However, that is the minimum mathematical answer. In real life you may well require more if the area to be covered is awkward or if you do not want to use all the off-cuts and end up with a mosaic.
53 and 1/3 paving slabs exactly.
Area of one paving slab = 2 x 2 = 4 m2 Area of courtyard = 16 x 30 = 480 m2 Slabs needed = 480/4 = 120.
45 required actually its 75 required (15 * 5)