Puzzle That Can Give The Brain A Nice Workout: Can You Solve It?

Here the appropriate answer  = 25 

Is it true that you are confounded with regards to how we showed up at that? Here's the way to go with regards to it: 

Begin addressing from left to right, Multiply  5 by 5, and you get 25. Then, at that point, partition your reply by 5, and that takes you directly back to 5.