Ask a Teacher

Search



the floor of a rectangular hole has perimeter 250 metre if the cost of painting the 4 walls @ of 10/m sq. is 15000. find height of wall ??
Let length, breadth, and height of the rectangular hall be l m, b m, and h m respectively.
Area of four walls = 2lh + 2bh
= 2(l + b) h
Perimeter of the floor of hall = 2(l + b)
= 250 m
? Area of four walls = 2(l + b) h = 250h m2
Cost of painting per m2 area = Rs 10
Cost of painting 250h m2 area = Rs (250h × 10) = Rs 2500h
However, it is given that the cost of paining the walls is Rs 15000.
? 15000 = 2500h
h = 6
Therefore, the height of the hall is 6 m.


comments powered by Disqus