Question

Aditya has built a cubical water tank with lid for his house with each outer edge equal to 1.5 m . He gets outer surface of the tank including the base, covered with square tiles of side 25 cm . Find how much he would spend for tiles if this cost of tiles is 480 rupees per dozen
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Answer 1

Given the length of each edge of water tank ( a) = 1.5 m = 150 cm.

Given, the base of water tank is not covered with tiles, So, five outer faces will be covered by squares tiles.

∴ Surface area of water tank =5a² = 5(150)²= 112500 cm²

side of square tile = 25 cm

So, Area of each square tile = (side)² = 25² = 625 cm²

Number of square tiles required = (Area of water tank) / (Area of each square tile

= 112500 / 625 = 180

Now, Given, Cost of 1 dozen tiles = Rs 480

So cost 1 tile = Rs 480 / 12 = Rs 40.

Cost of 180 tiles = 180 x 40 = Rs 7200.

Hence, he will spend Rs 7200 for the tiles.