Hameed has built a cubical water tank with a | vedclass

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(B) Since Hameed is getting the five outer faces of the tank covered with tiles,he needs to calculate the surface area of these five faces to determin

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$Rs. 5400$

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(B) Since Hameed is getting the five outer faces of the tank covered with tiles,he needs to calculate the surface area of these five faces to determine the number of tiles required.Edge of the cubical tank $(a)$ $= 1.5\, m = 150\, cm$.Surface area of the five faces $= 5 	imes a^2 = 5 	imes 150 	imes 150\, cm^2 = 112500\, cm^2$.Area of each square tile $= 25\, cm 	imes 25\, cm = 625\, cm^2$.Number of tiles required $= \frac{	ext{Total surface area}}{	ext{Area of one tile}} = \frac{112500}{625} = 180$.Cost of $1$ dozen $(12)$ tiles $= Rs. 360$.Cost of $1$ tile $= \frac{360}{12} = Rs. 30$.Total cost for $180$ tiles $= 180 	imes 30 = Rs. 5400$.

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