The length and breadth of a rectangular field are in the ratio 4:3 if the area of the field 8112msquare find the cost of fencing the field with wire 5 times at the rate of rupee 2.85per m
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Let l be the length of the rectangle.
The ratio of length to width is 4 : 3 and thus the width is 3/4l
The area is :
3/4l × l = 3/4l²
3/4l² = 8112
l² = 10816
l = √10816
l = 104m
Width = 3/4 × 104 = 78m
Perimeter = (78 + 104) × 2 = 182 × 2 = 364m
364 × 5 = 1820
1820 × 2.85 = 5187
Rs 5187
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