Question

The lenght and breadth of a rectangular garden are in the ratio 7:3.if the area of the field is 525m^2,then find the cost of fencing it at rupess 75 per m

Answer 1

let ,
the length be 7x and breadth be 3x

Area of rectangular garden= length × breadth
=> 525m²= 7x × 3x
=> 525m²= 21x²
=> 525/21= x²
=> 25= x²
=> √25= x
=> 5m = x
So, the length= 7x = 7 × 5m= 35m
And the breadth= 3x = 3 × 5m= 15m

Perimeter= 2(length + breadth)
=2(35m + 15m)
=70m + 30m
=100m
Cost of fencing per m= Rs 75
therefore,
Cost of fencing 100m= 75 × 100
= Rs 7500

Answer 2

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