Question

the floor of a rectangular hall has a perimeter 250m . if the cost of painting the four walls at the rate of rs 10 per m sq is Rs 15000 , find the height of the hall

Answer 1

I hope this will help you.

Area of four walls =15000/10=1500m²

2(l+b) *h=1500. (Perimeter=2(l+b) =250)


250*h=1500

H=1500/250

6m=height

Answer 2

Perimeter = 2(l+b)

250 = 2(l+b)

125 = l +b -------(1)

lateral surface area of cubiod or are of 4 Walls = Rs.15000/ Rs.10 per m

= 1500 m^2

formula of lateral surface area of cuboid = 2h(l+b)

so , 2h(l+b) = 1500 (l+b= 125)----(1)

2 × h × 125 = 1500
h = 1500/ 2× 125
= 1500/ 250
= 6 m