Raj has built a cubical water tank with lid for his house with each outer edge 3 m long. He gets the outer surface of the tank excluding the base, covered with square tiles, of side 50 cm. Find how much he would spend for the tiles, if the cost of the tiles is rs.180 per dozen.

Answer 1

so each face is 6x6 tiles
There are six faces, so ...

Answer 2

Didn't get you

Answer 3

oh, come on.
3m = 6 * 50cm
6 faces, each with 36 tiles makes 216 tiles
216 * 180/12 = ____ total cost