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A classroom is 7m long, 6.5m …

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A classroom 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 wall is to be colour washed, find the cost of colour washing at the rate of ₹3.5 per m².

Posted by K Kaviya 5 years, 4 months ago

CBSE > Class 09 > Mathematics

1 answers

Gaurav Seth 5 years, 4 months ago

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 = 4.2m²

Area of one window = 3 × 2 = 6m²

∴ Area of 3 windows = 3 × 2 = 6m²

∴ Area of the walls of the room to be colour washed = 108 - (4.2 + 6)

= 108 - 10.2 = 97.8m²

∴ Cost of colour washing @ Rs. 3.5 per square metre = 97.8 × 3.5 = Rs. 342.3

1Thank You

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