Question

the floor of rectangular hall has a perimeter 250m.if the cost of painting the four walls at the rate of 10 per meter saquare is rs 15000 fing height

Answer 1

Heya ...
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Here , 
perimeter = 250 m 
Let length = l 
Breadth    = b 
height       = h 
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we know 2(l + b) = 250 [Given]______(1) 
also area of four walls = 2h(l+ b) 
cost => 2h(l+b) x cost for 1m² = 15000
        => 2h(l+b) x 10                = 15000
        => 2(l+b)h                        = 1500
        => 250h                           = 1500 
        => h                                 = 1500/250 
        => h                                 = 6 m 
       

Answer 2

hello friend!!

here's your solution:-

let the height of the wall be 'h' metres.then,

area of the four wall = perimeter of the floor* height= (250*h)m^2=250h m^2.

cost of painting of 1 square metre = Rs 10
therefore cost of painting of four walls =Rs ( 250 h* 10)=Rs 2500 h.

but, it is given that cost of painting of four walls is Rs. 15000.

therefore 2500 h = 15000 ⇒ h= 15000/2500 =6

hence ,the height of the fall is 6m.

hope it helps ya :)