The floor of a room is of size 4 m × 3 m and its height

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The floor of a room is of size 4 m × 3 m and its height is 3 m. The walls and ceiling of the room require painting. The area to be painted is

1. 66 m²
2. 54 m²
3. 43 m²
4. 33 m²

Correct Option: B

Area of the four walls of the room = 2 × height (length × breadth)
= 2 × 3 (4 + 3) = 42 sq. metre
Area of ceiling = 4 × 3 = 12 sq. metre
∴ Total area = 42 + 12 = 54 sq. metre