Question

The length, breadth, height of a hall are 12m,10m,6m respectively.there are two doors measuring 2m×2m and each and two windows measuring 2m×1.5m each .find the cost of the whitewashing the walls and the ceilings of the hall at rate of ₹10 per m^2

Answer 1

first find the total surface area of cuboid by this formula 2×(lb+bh+hl)
and then find the area of one door by (l×b) then multiply it by 2 as no. of doors then find area of window as same as door and multiply it by 2
then area of cuboid -area of two doors- area of two windows and last step is our final area divides by 10 ( rate of whitewashing ) then final answer is 49 rupees