I'm not sure if you use "x" as your variable, so:
# + 5 = 3 or x + 5 = 3
This is an altitude. Shown by the right angle on the side opposite the point.
Not defective : 25 - 3 = 22
probability of not defective : 22/25
22/25 × 100% = 88%
Only 3 and 9 are both the subset of odd numbers and the subset of multiples of 3.