A class room is 7 m long, 6.5 m wide and 4 m high. It has one door 3 m x 1.4 m and three windows each measuring 2 m x 1 m. The interior walls are to be colour washed. Find the area to be colour washed.
I bet can anyone can give correct answer
(hint- 4 walls = lateral surface area
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Answer:
Dimensions of the room: length-7m, width-6.5m, height-4m. =108m sq. =4.2m sq.
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Step-by-step explanation:
Ques - A class room is 7m long, 6.5m wide and 4m high. It has one door 3m × 1.4m and three windows each measuring 2m × 1m The interior walls are to be color-washed. The contractor charges Rs. 15per sq. m. Find the cost of colour washing.
Ans - l = 7m, n = 6.5m and h = 4m
∴ Area of the room = 2( l + b)h = 2(7 + 6.5) 4 = 108m2
Area of door = 3 × 1.4 = 4.2m^2
Area of one window = 3 × 2 = 6m^2
∴ Area of 3 windows = 3 × 2 = 6m^2
∴ Area of the walls of the room to be colour washed = 108 - (4.2 + 6) = 108 - 10.2 = 97.8m^2
∴ Cost of colour washing @ Rs. 15 per square metre = Rs. 97.8 × 15 = Rs. 1467.
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