Hameed has built a cubical water tank with lid for his house, with each other edge 1.5 m long. He gets the outer surface of the tank excluding the base, covered with square tiles of side 25 cm. Find how much he would spend for the tiles if the cost of tiles is Rs 360 per dozen.
Given that
Hameed is getting 5 outer faces of the tank covered with tiles, he would need to know the surface area of the tank, to decide on the quantity of tiles required.
Edge of the cubical tank (a) = 1.5 m = 150 cm
So, surface area of the tank $=5 * 150 * 150 \mathrm{~cm}^{2}$
Area of each square tile $=\frac{\text { Surface Area of Tank }}{\text { Area of each Tile }}$
$=\frac{5 \times 150 \times 150}{25 \times 25}$
= 180
Cost of 1 dozen tiles, i.e., cost of 12 tiles = Rs 360
Therefore, cost of one tile = Rs. 360/12 = Rs.30
So, the cost of 180 tiles = 180∗30 = Rs.5400
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