Let's solve the question using the given clues one by one.
1. Number is less than twice of 15.
It means the number is less than 30.
2. It is more than twice of 12.
It means the number is more than 24.
So the number is between 24 and 30
3. The ones digit of the number is 5.
Between 24 and 30, the number with 5 at its one digit is 25.