A room is 9m long , 8 m broad and 6.5 m high. It has one door of dimensions 2m × 1.5m and three windows each of dimensions 1.5 m × 1m. Find the cost of white washing the walls at 6 rupees per sq. metre.
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Step-by-step explanation:
TSA of room = 2(lb+bh+hl)
=2(9*8 + 8*6.5 + 6.5*9)
=2(72+52+58.5)
=2(182.5) = 365 m2
area of door = length * breadth
= 2*1.5 = 3 m2
area of window = length * breadth
= 1.5*1 = 1.5 m2
area of 3 windows = 3*1.5 = 4.5m2
area of wall to be white washed=
TSA of room - (area of 3 windows + area of door) =365 - (4.5 + 3)
= 365-7.5
=357.5m2
cost of white washing = 6*357.5
rs. 2145
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