Mathematics
A rectangular room is 4.5 m long, 4 m wide and 3 m high. Find the cost of white washing its walls and the roof at ₹ 15 per square metre.
Surface Area, Volume, Capacity
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Answer
Given:
The length of the rectangular room = 4.5 m
The breadth of the rectangular room = 4 m
The height of the rectangular room = 3 m
Area of white washing its walls and the roof = l x b + 2(l + b)h m2
= 4.5 x 4 + 2(4.5 + 4)3 m2
= 18 + 2 x 8.5 x 3 m2
= 18 + 51 m2
= 69 m2
Rate of white wash = ₹ 15 per square metre
Total cost of white washing = Area x Rate of white wash
= ₹ 69 x 15
= ₹ 1,035
Hence, the cost of white washing walls and roof of rectangular room is ₹ 1,035.
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