Let breadth of the rectangle = x
Then, length of the rectangle = 5x - 4
We know that,
Perimeter of rectangle = 2(l+b)
So, breadth = x = 4 m and length = 5x - 4 = 5 x 4 - 4 = 16 m
Area of rectangle = l x b = 4 x 16 = 64 m2
Hence, the area of rectangle is 64 m2