Question

the dimensions of a room are 12.5 m by 9 M by 7 M there are two doors are for windows in the room is Tore measure 2.5 m by 1.2 M and its window 1.5 m by 7 M find the cost of the painting the wall at 3. 50 per square metre

Answer 1

Length of a door = 2.5m

Breadth of the door = 1.2m

area of the door = l * b = 2.5m * 1.2m = 3m2

∴ area of 2 doors = 2 * 3 = 6m2

Length of the window = 1.5m

Breadth of the window = 1m

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

∴ area of 4 windows = 4* 1.5 = 6m2

Area of the doors + Area of the windows = 6m2+ 6m2 = 12m2

Length of the wall = 12.5m

Breadth of the wall = 9m

Height of the wall = 7m

Area of the wall = LSA of a cuboid = 2h(l+b)

= 2 * 7 (12.5 + 9)

= 14 * 21.5 = 301m2

Required area of the wall to be painted = Area of the wall - Area of the doors and windows

i.e., area of the wall to be painted = 301m2 - 12m2

area of the wall to be painted = 289m2

Cost of painting 1m2 of the wall = Rs. 3.50

Cost of painting 289m2 of the wall = Rs. (3.50 * 289)

Cost of painting the wall = Rs. 1011.5

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