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 ceiling at the rate of Rs 7.50 per m2​

Answer 1

Answer:

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☘Answer ☘

✪ 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 ceiling at the rate of Rs 7.50 per m2

✪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,

Ф L is used for Length.

Ф B is used for Breadth.

Ф H is used for Height.

Explanation:

Answer 2

Answer:

rs 555

Explanation:

Length (l) of room = 5m

Breadth (b) of room = 4m

Height (h) of room = 3m

It can be observed that four walls and the ceiling of the room are to be white washed.

Total area to be white washed = Area of walls + Area of ceiling of room

= 2lh+2bh+lb

= [2×5×3+2×4×3+5×4]

= (30+24+20)

= 74

Area = 74 m2

Also,

Cost of white wash per m2 area = Rs.7.50 (Given)

Cost of white washing 74 m2 area = Rs. (74×7.50)

= Rs. 555