Question 765350
Width = x
Length = 3x - 4
Perimeter = 2 * width + 2 * length
144       = 2(x) + 2(3x - 4)
144       = 2x + 6x - 8
144       = 8x - 8
       8x = 144 + 8
       8x = 152
        x = 19
Width = 19m
Length = 53m
Hope this helps.
:-)