Question 1112
 Let the width of the path be x meters,the combined width and length would
 be 10+2x and 20+2x.
 So we have 
 (10 + 2x) (20+2x) = 600,
 Divided both sides by 4:
 (x+5)(x + 10) = 150, 
 Multiply out the left hand side and simplify:
 x^2+ 15 x -100 = 0, 
 Factor:
 (x+20) (x-5) = 0
  So, x = 5 or x = -20 (negative,invalid)

 Answer: 5 meters.