Question

length breadth and hight of a room are 15m,12m and 8m, respectively find the cost of white washing the room at the rate of rs8 per m if it has a door measuring 4m×1.5m and to windows each measuring 3m×2.5m​

Answer 1

area of white washing = LSA of wall -(area of door + 4×(area of window))

= 2h(l+b)- 4×1.5+(4×3×2.5)

=16×20- (6 + 30)

=320-6-30

=284m^2

cost =284×8=₹2272

hope it helps