Hameed has built a cubical water tank with lid for his house, with each outer edge 1.5 m long. He gets the outer surface of the tank excluding the base, covered with square tiles of side 25 cm (see Fig. 13.5). Find how much he would spend for the

Explanation

Leaving aside the base, the remaining five faces of the tank are to be covered with lies.
Length of each edge of the tank `= 1.5 m = (1.5 xx 100) cm`
`= 150 cm`.
Surface area of each face `= (150 xx 150) cm^(2)`
Total surface area of five faces to be covered with tiles
`= (5 xx 150 xx 150) cm^(2)`
Area of each square tile `= (25 xx 25) cm^(2)`
Number of tiles required `= ("surface area of five faces")/("area of each tile")`
`= ((5 xx 150 xx 150)/(25 xx 25)) = 180`
Cost of 12 tiles = Rs 540
Cost of 1 tile `= Rs ((540)/(12))`
Cost of 180 tiles `= Rs ((540)/(12) xx 180) = Rs 8100`