Q76 of 131 Page 226

A wall of a room is of dimensions 5 m × 4 m. It has a window of dimensions 1.5 m × 1m and a door of dimensions 2.25 m × 1m. Find the area of the wall which is to be painted.

Given, a wall of a room is of dimensions 1.5 m × 1m.


Area of the wall = l × b = 5 × 4 = 20 m2


Area of the window = l × b = 1.5 × 1 = 1.5 m2


Area of the door = l × b = 2.25 × 1 = 2.25 m2


Area of the wall to be painted = Area of the wall – (Area of the window + Area of the door)


∴ Area of the wall to be painted = 20 – (1.5 + 2.25) = 20 – 3.75 = 16.25m2


Area of the wall which is to be painted= 16.25 m2


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