Answer:
54 feet
Explanation:
Perimeter of a rectangle = 2 × (length + breadth) 
The perimeter of Edwin's garden is 36 feet : 
36 = 2 x (length + breadth)
divide both sides by 2 to determine the sum of the length and breadth of Edwin's garden
36/2 = (length + breadth)
18 = (length + breadth)
Tony's garden is 4 feet longer and 5 feet wider than Edwin's garden
The dimensions of Tony's garden is : 
(4 + l) + (5 + w) = 9 + l + w 
Where : 
 l = length 
w = width
The sum of the length and breadth of Tony's garden would be 9 feet more than that of Edwin 
Sum of Edwin's garden = 9 + 18 = 27 
Perimeter of Edwin's garden = 27 feet x 2 = 54 feet