. The area of a rectangular park is 2160m2 .The length and breadth of the park is in the ratio 5:3. Find the cost of fencing the park at Rs.25 per metre.
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Width = 3a
Area = 2160
=> 5a *3a = 2160
=> 15 a^2 = 2160
=> a^2 = 144
=> a = 12
Length = 60 m
Width = 36 m
Perimeter = 2(60+36)
= 2 * 96
= 192 m
Cost = Perimeter *rate
= 192 * 25
= Rs 4800
Let the length be 5a
Width = 3a
Area = 2160
=> 5a *3a = 2160
=> 15 a^2 = 2160
=> a^2 = 144
=> a = 12
Length = 60 m
Width = 36 m
Perimeter = 2(60+36)
= 2 * 96
= 192 m
Cost = Perimeter *rate
= 192 * 25
= Rs 4800
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