Answer:
The width of the park is, 16 feet
Explanation:
let x be the width of the park.
As per the statement:
The length of a rectangular park is 20 feet longer than the width of the park.
⇒Length of the park = 20 + x ....[1]
It is also given that:
If the length of the park is 36 feet.
⇒Length of the park = 36 feet
Substitute in [1] we have;

Subtract 20 from both sides we have;

Simplify:

or
x = 16 feet
Therefore, the width of the park is, 16 feet.