Question

room is 5m long, 4m broad and 3m high. Find the area of the four walls. Also find the area of the ceiling and the area of the floor. If it costs Rs.30 to whitewash 1m2 of wall, find the cost of whitewashing the four walls and the ceiling. (

Answer 1

area of 4 walls= 2h (l+b)
=2×3 (5+4) =54m^2 .
Area of ceiling = (l×b) =20m^2 ,
Area of floor is equal to ceiling area as room is of cuboidal shape , so area is 20m^2.
Area of 4 walls +area of ceiling =(54+20) m^2 =74m^2.
total cost = rate × area = ( 30×74) =222 rupees

Answer 2

Answer:

cost of whitewashing of four walls and ceiling is 222 rupees