Question

The floor of a rectangular hall has a perimeter 250 m. If the cost of painting of four walls at the rate of 10 per m² is rs. 15000, find the height pf the hall.
(Hint : Area of the four walls = Lateral Surafec Area)
Give only correct ans. no any extra replies​

Answer 1

$\red{\textbf{Answer :- 6m }}$

Step-by-step explanation:

$\Large\textsf{Given :-}$

Perimeter=250m

⇒Area of 4 walls =2lh+2bh

=2(b+l)h

⇒Perimeter of floor of wall =2l+2b

⇒2(l+b)=250 m

∴ Area of 4 walls =2(l+b)h

$= 250 {hm}^{2}$

⇒Cost of painting per m^2 area = Rs. 10

⇒Cost of painting 250hm^2 area = Rs(250h×10)

= Rs.2500h

⇒Painting cost of walls = Rs. 15000

⇒2500h=15000

⇒$h = \LARGE\frac{15000}{2500}$

⇒h=6m

∴$\Large\textsf{The height pf the hall is 6m}$