Let the breadth of the mango grove be x metres.
Length = 2 × breadth = 2x metres
Area = length × breadth = 2x × x = 2x2
Area = 800 sq m
2x2 = 800
Or x2 = 400
∴ x = ±20
Breadth cannot be negative.
∴Breadth = 20 m and Length = 40 m.
YES. It is possible to have a mango grove whose length is twice the breadth and whose area is 800 m2.