Aditya has built a cubical water tank with lid for his house with each outer edge 1.5m long . he gets the outersurface of the tank excluding the base covered with square tiles of 25cm . find how much would he spend for tiles if the cost of tiles is RS480 per dozen .



Edge  of the tank=150cm
surface area of the tank=5*150^2
area of each tile=25^2
so no of tiles req.=5*150^2/25^2=180
cost of 12 tiles =480
cost of 1 tile=480/12=40
cost of 180 tiles=180*40=7200....

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