Answer :
Let the breadth of mango grove be l.
Length of mango grove will be 2l.
Area of mango grove = (2l) (l) = 2l2
2l2 = 800
=
⇒ 
⇒ l2 = 400
However, length cannot be negative.
Therefore, breadth of mango grove = 20 m
Length of mango grove = 2 × 20 = 40 m
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