Let us assume the number = x
Then
(25/100) * x = 41
25x = 4100
x = 4100/25
= 164
so the unknown number comes out to be 64, This is one of the simplest way to clearly get to the solution that is required. I hope the procedure is clear enough for you to understand. Only while deducing the result, be careful about the calculation part.In future you can always use this procedure for finding the solutions to similar problems.