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# Classroom classroom 7 m long 6.5 … ## CBSE, JEE, NEET, CUET

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Classroom classroom 7 m long 6.5 m wide and 4 m high it has 123 m into 1.4 m and the three windows each measure into metre into 1 m the interior walls are to be colour washed the contractor charges rs 15 per square metre find the cost of colour and washing

Preeti Dabral 3 months, 1 week ago

For class room : l = 7m, b = 6.5 m, h = 4 m
∴ Area of walls of the room = 2(l + b)h = 2(7 + 6.5)4 = 108 m2
Area of door = 3 × 1.4 = 4.2 m2
Area of one window = 2 × 1 = 2 m2
∴ Area of 3 windows = 3 × 2 = 6 m2
∴ Area of the walls of the room to be colour washed = 108 – (4.2 + 6)
= 108 – 10.2 = 97.8 m2
∴ Cost of colour washing the classroom at Rs. 15 per square metre = Rs 97.8 × 15 = Rs. 1467.

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