A bathroom floor measures 3.5 m in length and 2 m in width. One of its walls, which is to be tiled fully, measures 2 m in length and 2.5 m in height. If square tiles of side 25 cm are used, and an extra 12% of tiles are purchased to cover cuts and wastage, how many tiles are needed in total?
90
Wall area to be tiled = 2 × 2.5 = 5 sq m = 50000 sq cm. Each tile's area = 25×25 = 625 sq cm, so tiles needed = 50000/625 = 80. Adding 12% extra for wastage: 80 × 1.12 = 89.6, rounded up to 90 tiles.
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