The floor of a room is of size $$4m \times 3m$$ and its height is 3m. The walls and ceiling of the room require painting. The area to be painted is
Area of walls and ceiling of room = area of 4 walls + area of 1 ceiling
                        = $$(2 \times (3 \times 3) + 2\times (4 \times 3)) + 4 \times 3$$
                        = 18 + 24 + 12 = 54
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