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A room 9 m long, 6 m broad and 3.6 m high has one door 1.4 m by 2 m and two windows, each 1.6 m by 75 cm. Find:
(i)The area of 4 walls, excluding doors and windows
(ii) the cost of white-washing the walls from inside at the rate of Rs. 22.50 per m²
(iii) the cost of painting it's ceiling at Rs. 25 per m²
Need well explained answer.
Best of luck !!!
A room 9 m long, 6 m broad and 3.6 m high has one door 1.4 m by 2 m and two windows, each 1.6 m by 75 cm. Find:
(i)The area of 4 walls, excluding doors and windows
(ii) the cost of white-washing the walls from inside at the rate of Rs. 22.50 per m²
(iii) the cost of painting it's ceiling at Rs. 25 per m²
Need well explained answer.
Best of luck !!!
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Answer:
Area of 4 walls including doors and windows = 2 (9+6) 3.6
= 30 × 3.5
108m²
Area of doors and windows = 2 (1.6 × 7.5) + 1.4 × 2.
= 2 (1.2) + 2.8
= 2.4 + 2.8
5.2m²
i) The area of 4 walls, excluding doors and windows.
108 - 5.2
102.8m²
ii) The cost of white-washing the walls from inside at the rate of Rs. 22.50 per m².
⟹ 102.8 × 22.50
2318
iii) The cost of painting it's ceiling at Rs. 25 per m².
⟹ 9 × 6 × 25
1350