The width of the walkway is 3 feet, If the area of the garden is 484
and the area covered by both the garden and the walkway (the entire square) is 784
.
Step-by-step explanation:
The given is,
Area of the garden is 484 
Area covered by both the garden and the walkway (the entire square) is 784
.
Let, x - Width of the walkway
Step:1
Formula to calculate area of square is,
...........................(1)
Where, r - Radius of square
Step:2
For garden,
A = 484 
Equation (1) becomes,

Take square root on both sides,

a = 22 feet
For garden and the walkway (the entire square),
A = 784 
Equation (1) becomes,

Take square root on both sides,

a = 28 feet
Step:3
Ref attachment,
Side of garden and the walkway =
Side of garden + 2 (width of the walkaway)....(1)
28 = 22 + 2 ( x )
2 ( x ) = 28 - 22
= 6

Width, x = 3 feet
Result:
The width of the walkway is 3 feet, If the area of the garden is 484
and the area covered by both the garden and the walkway (the entire square) is 784
.