Present age of A is x years and the present age of B is thrice the age of A nine years ago. The difference between the present ages of A and B is thrice the present age of C. If the age of C after 2 years is the smallest two-digit prime number, then find the difference between the age of A after five years and the age of B after twelve years.
1
40
2
38
3
34
4
24
5
36