Question

The floor of a rectangular hall has a perimeter 150 m. If the cost of painting the four
walls at the rate of 10
per m²’ is ₹ 9000, find the height of the hall.
[Hint: Area of the four walls = Lateral surface area.]​

Answer 1

Answer:

Step-by-step explanation:

Height - 6m

Solution-perimeter=2(a+b)=150m

So a+b=75

And a=75-b

Now total area of 4 walls =9000/10=900

Let height be c

So 2(ac+bc)=900

ac+bc=450

(75-b)c+bc=450

C=450/75=6m