The cost of painting the four walls of a room is Rs. 350. The cost of painting a room three times in length, breadth and height respectively will be?
Correct Answer: Rs. 3150
Explanation:
Area of 4 walls of the room = [2 (l + b ) x h ]m2
Area of 4 walls of new room = [2 (3l + 3b) x 3h]m2
= 9 x [2(l + b) x h ]m2
∴ Cost of painting the 4 walls of the new room = Rs. (9 x 350)
= Rs. 3150
