25 penaties decreased by 32% is how many penalties

Most of the required information's are already given in the question and based on those information's the answer to the question can be easily deduced.
Total number of penalties = 25
Percentage of decrease in penalty = 32%
Then
Amount of penalty decreased = (32/100) * 25
                                                 = 8
Then
The number of penalties after decrease = 25 - 8
                                                                 = 17
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.

One unique triangle, because those angles add up to 180, and that's how many degrees there are in one triangle.

No a triangle cannot be formed because when you add the two smallest number together (which would be 11) the have to be bigger than the number it is "against" ( which would be 12)