Question

The floor of a rectangular hall has a perimeter 120 m. If the cost of painting the four walls at the rate of ₹ 10 per m2 is ₹ 6000, then find the height of the hall

Answer 1

Answer:

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

=250h m  

2

 

⇒Cost of painting per m  

2

 area = Rs. 10

⇒Cost of painting 250h m  

2

 area = Rs(250h×10)

= Rs.2500h

⇒Painting cost of walls = Rs. 15000

⇒2500h=15000

⇒h=  

2500

15000

​  

 

⇒h=6m

Step-by-step explanation: