Question

The floor of a rectangular hall has a perimeter 250 m. If the cost of painting the four walls at rate of Rs. 10 per m² is Rs. 15,000. Find the height of the hall.

Answer 1

Given perimeter of the rectangular floor = 250 m
Hence 2(l + b) = 250
Therefore, (l + b) = 125 --- (1)
Area of four walls, A = 15000/10 = 1500 sq m
That is 2h(l + b) = 1500
2h x 125 = 1500
h = 1500/250 = 6
Thus the height of the hall is 6 m
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Answer 2

area of four walls = 15000/10
2 (l +b)h = 1500m^2
250 * h = 1500
h = 1500/250
h = 6 m