Question

Amit 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. Find how much he would spend for the tiles, if the cost of the tiles is Rs. 360 per ten

Answer 1

The length of the each side of water tank =1.5m=150cm

As it is given that base is not covered with tiles so, five sides of the tank are  

covered with tiles.

Therefore,

Surface area of water tank =5a  

2

=5(150)  

2

=112500 cm  

2

 

Side of tile =25 cm

Area of tile =25  

2

=625 cm  

2

 

Number of tiles to cover five sides of the tank =  

625

112500

​

=180

Now,

Cost of one dozen tiles =Rs.360

Hence, total cost of 180=  

12

360

​

×180=Rs.5400