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 7.50 per m2.​

Answer 1

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Answer 2

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Answer:

• The cost of white washing the walls of the room and the ceiling at the rate of Rs 7.50 per m² = Rs. 555.

Given:

• L = 5m
• B = 4m
• H = 3m

Need To Find:

• The cost of white washing the walls of the room and the ceiling at the rate of Rs 7.50 per m². = ?

Explanation:

Formula used here:

• Lateral surface area = L × B

= 2h (L + B) + L × B

Putting the values according to the given formula:

= 2 × 3(5 + 4) + 5 × 4

= 2 × 3 × 9 + 5 × 4

= 54 + 20

= 74 m²

Now:

Cost of white washed 1m = Rs. 7.50

Cost of 74 m = 74 × 7.50

= 74 × 750/100

= 555

Therefore:

• The cost of white washing the walls of the room and the ceiling at the rate of Rs 7.50 per m². = Rs. 555.

Additional Information:

Here,

• L is used for Length.
• B is used for Breadth.
• H is used for Height.

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