1.

The area of 4 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 the area of the floor?1). 40 m22). 50 m23). 60 m24). 80 m2

Answer»

Let the breadth and length of the room be ‘X’ and ‘2X’;

Height of the room is given 4 m;

Area of 4 walls = 2(l + b) × h

⇒ 120 = 2(3x) × 4

⇒ 3x = 15

⇒ x = 5 m

Breadth = 5 m and Length = 10 m

∴ Area of the floor = 50 m2


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