Q.1) a rectangular swimming pool 30m long, 20m wide, and 1.5m deep is to be tiled. If each tile is 50cmx50cm, how many tiles will be required? (remember, there is no roof for the pool)
Length, l = 30 m ; breadth, b = 20 m ; height, h = 1.5 m
Area to be tiled = Total surface area - Area of the top
Total surface area = 2(lb + lh + bh) = 2(600 + 30 + 45) = 2 ( 675 )= 1350 m2
Area of the top = 30 20 = 600 m2
Area to be tiled = 1350 - 600 = 750 m2 = 75,00,000 cm2
side of each tile, s = 50 cm
Area of each tile = s2 = 502 = 2500 cm2
∴ Number of tiles that will be required = 75,00,000 / 2500 = 3000