The average age of a group was 15 years, three new members A, B, and C joined the group, now the average age of the group is increased by 1. Age of A is 3 years less than B’s age and the age of C is 6 years more than A’s age. If the initial number of members in the group was 18, then find the age of C.
1
30 years
2
35 years
3
25 years
4
20 years
5
40 years