Question

The cost of putting a fence around a square field at Rs 2.50 per metre is Rs 200. The length of each side of the field is

(a) 80 m
(b) 40 m
(c) 20 m
(d) None of these

Answer 1

(c) 20 m

Cost of fencing the square field = Rs. 200

Rate of fencing the field = Rs. 2.50

Now, perimeter of the square field = $\frac{Costoffencing}{Rateoffencing}$ = $\frac{200}{2.50}$ = 80 m

Perimeter of square = 4 $\times$ Side of the square

Therefore, side of the square = $\frac{Perimeter}{4}$ = $\frac{80}{4}$ = 20 m