Most of the required informations are already given in the question and based on those informations the answer to the question can be easily deduced.
Total number of penalties = 25
Percentage of decrease in penalty = 32%
Amount of penalty decreased = (32/100) * 25
The number of penalties after decrease = 25 - 8
So the number of penalties comes out to be equal to 17. I hope the procedur is clear enough for you to understand. You can definitely use this procedure for solving similar kind of problems in future without requiring any help from outside.
32% of 25 penalties are:
25 penalties* (32/100)= 8 penalties.
25 penalties -8 penalties= 17 penalties.
The final answer is 17 penalties