Question

The cost of making a fence around a square field is rupees 480 at the rate of 12 rs per meter. What is the length of each side of the field?

Answer 1

The fencing is done at the perimeter of square ... hence,
Total cost of fencing / cost of fencing per m
= parameter of square .

Now,
Cost of fencing = 480 rupee
Cost per m = 12 rs/m
Parameter of square = 480/12 = 40m
Now, as we know parameter of square is given by,
Parameter = 4a ( A is side of square)
As calculated, parameter = 40m
So,
40 = 4a
a = 40/4 = 10m.
So,
Lenght of each side is 10m