Question

The floor of a rectangular hall has a perimeter of 250 m .Its height is 6 m .Find the cost of painting its four walls at the rate of rs 10 per m sq

Answer 1

Perimeter = 250m

Height of the wall = 6m

Area of all 4 walls = $length*breadth$

                              = $250m*6m$

                              = $1500m^{2}$

Cost of painting it = $1500*10$

                              = ₹15000

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Answer 2

Answer:

250 = 2( l + b )             (Perimeter of rectangle)

250/2 = l + b

125 = l + b  .............    (1)

Area of four walls = 2h (l+b)

  Put equation (1) in Area of four walls

2h(l+b)

2 x 6 (125)

12 (125)

= 1500 m square

Cost Of Painting  = 1500 x 10

                            = 15000 rupees