Question

10 perm
of a rectangular hall has a perimeter 250 m. If the cost of painting the four
walls at the rate of 10 per m'is 15000, find the height of the hall.
Hint: Area of the four walls =Lateral surface area.​

Answer 1

Answer:

at first we find area of four wall

so, area of four wall= total cost of painting/cost of 1 meter of painting

so, area of four wall= 15000/10

area of four wall = 1500

now we know the perimeter of rectangular hall is 250m

perimeter of wall = 2(l+b)

now we know that

area of four wall= 2(l+b)h

area of four wall= perimeter×h

area of four wall =1500

perimeter×h=1500

250×h=1500

h=1500/250

h=4