Question

the walls and ceiling of a room are to be plastered. the Length breadth and height of the room are 4.5 M 3 m and 350cm respectively find the cost of plastering ar rupee 8 per metre square

Answer 1

$\mathbb{ SOLUTION }$ :

Given :
length (l) = 4.5 m
breadth (b) = 3 m
height (h) = 350 cm = 3.5 m

Cost of plastering = Rs. 8 per meter square

Area of the walls = 2h (l + b)

Area of the walls = 2×3.5(4.5 + 3

Area of the walls = 52.5 m²

Area of ceiling = lb = 4.5×3 = 13.5 m²

Area of room = 52.5 + 13.5 = 66 m²

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

Answer 2

Given :
length = 4.5 m
breadth = 3 m
height = 350 cm = 3.5 m

Rate of plastering = Rs. 8 /m²

Area of 4 walls = 2height(length + breadth)

Area of 4 walls = 2×3.5(4.5 + 3

Area of 4 walls = 52.5 m²

Area of ceiling = length×breadth = 4.5×3 = 13.5 m²

Area of room = 52.5 + 13.5 = 66 m²

Now,

The cost of plastering = 66 × 8 = Rs. 528


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