Answer:
25
6, 12, 18, 24 (Any four numbers from 1 to 25 would be correct)
Step-by-step explanation:
The most effective way to this with whole numbers is to find an irreducible fraction that represents 16%. Coincidentally, we were already given that 16% represents a 4 in 25 chance, which is an irreducible fraction.
Therefore, the most efficient way to do it is to generate numbers from 1 to 25, and then arbitrarily choose any four numbers (i.e. 6, 12, 18, 24) within that range to represent a success.