Question

a hall os 38 m long and 22 m broad alloying 36m² for door and window , the cost of whitewashing the wall at RS .10/m²is 8000 rs ? find the height of wall​

Answer 1

Answer:

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Answer 2

Answer:

We have,

Length of the hall = 36 m

Breadth of the hall = 24 m

Let h be the height of the hall.

Now, in papering the wall, we need to paper the four walls excluding the floor and roof of the hall.

So, the area of the wall which is to be papered = Area of 4 walls

= 2h(l + b)

= 2h (36 + 24) = 120h m2

Now, area left for the door and the windows = 80 m2

So, the area which is actually papered = (120h − 80) m2

Again,

The cost of papering the walls at Rs 8.40 per m2 = Rs. 9408.

⇒ (120h − 80) m2 x Rs. 8.40 per m2 = Rs. 9408

⇒ (120h − 80) m2 = Rs. 9408Rs. 8.40

⇒ (120h − 80) m2 = 1120 m2

⇒ 120h m2 = (1120 + 80) m2

⇒ 120h m2 = 1200 m2

∴ h =1200 m2120 m=10 m

Hence, the height of the wall would be 10 m.