Question

the walls and ceiling of a room are to be plastered the length,breadth,and height of the room are 4.5 m,3m, and 350 cm respectively.find the cost of plastering the room at the rate of rupees 12 per m²​

Answer 1

Answer:

Given, length of the room (l) = 4.5 m

Breadth of the room (b) = 3m

Height of the room (h) = 350 cm = 3.5 m

And the cost of plastering = Rs. 8perm

2

Therefore, the area of the walls = 2h(l+b)

= 2×3.5×(4.5+3) = 7×(7.5) = 52.2 m

2

Area of the ceiling = lb = 4.5×3 = 13.5m

2

Area of the room = 52.5+13.5 = 66m

2

Hence, the cost of plastering = 66×8 = Rs 528

Step-by-step explanation:

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Answer 2

Answer:

Given, length of the room (l) = 4.5 m

Breadth of the room (b) = 3m

Height of the room (h) = 350 cm = 3.5 m

And the cost of plastering = Rs. 8perm

2

Therefore, the area of the walls = 2h(l+b)

= 2×3.5×(4.5+3) = 7×(7.5) = 52.2 m

2

Area of the ceiling = lb = 4.5×3 = 13.5m

2

Area of the room = 52.5+13.5 = 66m

2

Hence, the cost of plastering = 66×8 = Rs 528