The average age of four members A, B, C and D is 40 years. When D whose age is 33 years is replaced by two members E and F, the average age of the group increases by 2 years and F is 7 years older than E. Find the sum of the ages of E and F.
1
80 years
2
81 years
3
82 years
4
83 years
5
84 years