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 tiles, if the cost of the tiles is Rs 360 per dozen.

Explanation

Area of square tile=`25*25cm^2=625cm^2=0.0625m^2`

Outer surface area which need to be filled with tile=`5a^2`

=`5(1.5)^2`

=`11.25m^2`
n*Area of tile=Total Surface Area to be covered

`n*0.0625m^2=11.25m^2`

`n=180`

Total Cost

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