Question 67412
Let the width of the field be x ft.
So length = (2x-5) ft 
Perimeter = 2[ length + width]
 2[2x-5+x] = 230
 2{3x-5} = 230
 6x - 10 = 230
  6x = 240
  x = 40 
Thus the width of the field = 40 ft.
Length = 2x-5
       = 2*40 - 5
       = 80 - 5
       = 75 
Width = 40 ft and length = 75 ft