Question

The length, breadth and height of a room are 5 m, 4 m and 3 m respectively. Find the

cost of white washing the walls of the room and the ceiling at the rate of Rs.12 per m2.

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Answer 1

Answer:

Rs 555

Step-by-step explanation:

Total cost of white washing =74×7. 50= Rs 555

Answer 2

Question :-

The length, breadth and height of a room are 5 m, 4 m and 3 m, respectively. Find the cost of white washing the walls of the room and the ceiling at the rate of ₹17.50 per m^2.

Answer :-

Length of the room (l) = 5 m

Breadth of the room (b) = 4 m

Height of the room (h) = 3 m

The room is like a cuboid whose four walls (lateral surface) and ceiling are to be white washed.

∴ Area for white washing

= [Lateral surface area] + [Area of the ceiling]

= [2(l + b)h] + [l x b]

= [2(5 + 4) x 3] m^2 + [5 x 4] m^2 = 54 m^2 + 20 m^2 = 74 m^2

Cost of white washing for 1 m2 area = Rs. 7.50

∴ Cost of white washing for 74 m^2 area = Rs. (7.50 x 74) = Rs. 555

Thus, the required cost of white washing = Rs. 555

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