The side of square bed = 1 m.
Area of square bed = side×side = 1 m×1 m = 1 m2.
∴ Area of 5 square beds = 1×5 = 5 m2.
Now, Length of land = 5 m.
Breadth of land = 4 m.
∴ Area of land = length×breadth.
= 5 m×4 m = 20 m2.
Area of remaining part = Area of land - Area of 5 flower beds.
= 20 m2−5 m2=15 m2.