Here's the question:
The are of a rectangular field is 2275meters squared. The field is enclosed by 200m of fencing. What are the dimensions of the field?

supplose length is x and breadth y

2x + 2y = 200

x + y = 100

xy = 2275

x ( 100 - x) = 2275

x^2 - 100 x + 2275 = 0

Solve this and get value of x

Then from above (x + y = 100) you can get value of y.