The area of the four walls of a room is 660 m² and

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The area of the four walls of a room is 660 m² and its length is twice its breadth. If the height of the room is 11 m, then area of its floor (in m²) is

Let Breadth of room = x metre Length = 2x metre
∴ Area of four walls = 2 × h (l + b)
⇒ 660 = 2 × 11 (2x + x) = 22 × 3x = 66 x

⇒ x =	660	= 10
	66

∴ Area of floor = 2x² = 2 × 10² = 200 sq.metre