Question

A door of 5.5 x 4 m2 and two windows,
each of 2.5 X 2.4 m2 are fitted in a wall.
The length and breadth of a wall are
22.5 m and 18 m respectively. Find the
cost of colouring the wall, if the rate of colouring the Wall is rupees 15 per m²
​

Answer 1

Answer:

It is given that length, breadth and height of a room are 8 m, 5 m and 3 m respectively.

Area of four walls of the room is: 2h(l+b)

A=2h(l+b)=2×3(8+5)=6×13=78 m

2

Area of the ceiling is:

A=l×b=8×5=40 m

2

Total area of the four walls and the ceiling of the room is 78+40=118 m

2

It is given that cost of white washing is Rs.15/m

2

, therefore,

Total cost of white washing is:

118×15=1770

Hence, the cost of white washing the walls is Rs.1770.