Answer:
Total number of hikes in the state park = 24
Explanation:
Let the number of trails available in the state park = t
Since, Brenda has completed 25% of the total trails, number of trails completed by her = 25% of t
=

= 0.25t
As per ranger she has completed 6th hiking trail,
6 = 0.25t
t =

t = 24
Therefore, total number trails to hike in the state park = 24.