Question

the floor of a rectangle hall has a perimeter 150m if the cost of painting the four wall at the rate of rupees 10 per metre square is rupees 9000 find the height of the wall​

Answer 1

Answer:

The height of the hall is 6m.

Step-by-step explanation:

It is given that perimeter of floor = 150 m

2 ( l + b ) = 150 m

l + b = 150 / 2 m

l + b = 75 m

l = ‘75 - b’ m. => 1

Cost of painting the four walls = ₹9000

Cost of printing per sq.m = ₹ 10

Area of four walls (CSA of the hall) = 9000 / 10

= 900 m^2

=> consider the height as ‘h’.

2h (l+b) = 900 sq.m

2h ( 75-b+b) = 900 sq.m. ( from 1 )

2h (75) = 900

2h = 900/75

2h = 12

h = 12 / 2

h = 6 m

Hence, the height of the hall is 6 m .