The garden is 24 ft by 14 ft
The walkway stretches all the way around the garden
The walkway is 4 ft wide
Perimeter is found by adding the length of the four sides so this would be 24 + 14 + 24 + 14 = 76
24 + 24 = 48
14 + 14 = 28
48 + 28 = 76
I don't know for sure but I think the length would be 34 using the length formula
p / 2 - w
so 76 / 2 - 4
38 - 4
34
I have no clue though. A picture would make it easier