Question

The length, breadth and height of a room are 5 m, 4 m and 3 m respectively.in
the cost of white washing the inner of the room and ceiling at the rate of rupees 50
per square metre.​

Answer 1

• Cost of white washing the four walls and ceiling of room is Rs 3700

Step-by-step explanation:

To Find :

• we need to find the cost of white washing the inner room and ceiling at the rate of 50 per square meter.

Solution :

» Length of room = 5m

» Breadth of room = 4m

» Height of room = 3m

《 Area if four walls = 2h(l + b) 》

= 2 × 3 (5 + 4)

= 6(9)

= 54m²

< Area of ceiling = Length × Breadth >

= 5 × 4

= 20m²

Total area of room = Area of four walls + Area kf ceiling

= 54 + 20

= 74m²

Cost of white washing the room at the rate of 50 Per square metre :--

= 50 × 74

= Rs 3700

$\bf\dag{\underline{\underline{\red{Cost \:of\: white\: washing = Rs\:3700}}}}$

Answer 2

Step-by-step explanation:

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

Area of four walls of room = 2h(l + b)

Substitute the values,

→ 2*3(5 + 4)

→ 6(9)

→ 54 m²

Also said that the cost of white washing the inner of the room and ceiling at the rate of rupees 50.

Now,

Area of ceiling = Area of rectangle = length × breadth

Substitute the values,

→ 5 × 4

→ 20 m²

Total area white washed = Area of four walls + Area of ceiling

= (54 + 20) m²

= 74 m²

Therefore, the cost of white washing the inner of the room and ceiling at the rate of rupees 50 is 74*50 = Rs. 3700