The length,breath and height of a room are 5m,4m and 3m respectively. find the cost of white washing the wall of the room and the ceiling at the rate of rupees 7.50 per m3
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Answer:74 metre square
Step-by-step explanation: Area of whitewashing the wall and ceiling -total surface area minus area of one face (floor is not whitewashed so 5 walls) Total surface are of cuboid - 2 (lb+bh+hl) I.e. 2(20+12+15) is equal to 94 metre square area of one face - length into breadth I.e. 5 into 4 which is equal to 20 metre square Therefore ,Area to be white washed is 20 subtracted by 94 that is 74 metre square
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