Question

9. The area of four walls of a room is 210 m2. If the length of the room is twice its breadth and the
height is 5 m. Find the area of the floor.
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Answer 1

Let the breadth = x metres and length = (2x) metres.

Area of 4 walls = [2(2x + x)× 5 ] m2 = (30x) m2

∴ 30x = 120

⇒ x = 40

So, length = 80 m, and breadth = 40 m

Area of the floor = (40 × 80) m2 = 3200 m2