2016 · Q41
The area of four walls of a room is 120 m². The length of the room is twice its breadth. If the height of the room is 4 m, what is area of the floor ?
Elementary MathematicsMensuration
- A40 m²
- B50 m²
- C60 m²
- D80 m²
Explanation
Four-wall area 2h(l+b) = 120 with h = 4 and l = 2b gives 8×3b = 120, so b = 5 and l = 10. The floor area is 10×5 = 50 m² (option B).