Question

A room is 9 m long, 8 m broad and 6.5 m high. It has one door of dimensions
2m x 1.5 m and three windows each of dimensions 1.5 m x 1 m. Find the cost of white
washing the walls at Rs 3.80 per square metre.

Please explain me And I will mark you as brainliest​

Answer 1

Rs. 811.30

Step-by-step explanation:

Given Length of a room = 9 m Breadth of a room = 8 m Height of a room = 6.5 m Area of 4 walls = 2(1 + b) h = 2 (9 m + 8 m) x 6.5 m = 2 x 17 m x 6.5 m = 221 m2 Length of a door = 2 m Breadth of a door = 1.5 m Area of a door = Length x Breadth = 2 m x 1.5 m = 3 m2 Length of a window = 1.5 m Breadth of a window = 1 m Since, area of one window = Length x Breadth = 1.5 m x 1 m = 1.5 m2 Thus, Area of 3 such windows = 3 x 1.5 m2  = 4.5 m2 Area to be white washed = Area of 4 walls – (Area of one door + Area of 3 windows) Area to be white washed = [221 – (3 + 4.5)] m2  = (221 – 7.5) m2  = 213.5 m2 We have cost of white washing for 1 m2 area = Rs. 3.80 Cost of white washing for 213.5 m2 area = Rs. (213.5 x 3.80) = Rs. 811.30