AP Police SI Exam Prelims 2016 Paper 1 (Mental Ability)

The average age of A, B and C is 84 years. If D joins them, then the average age of that group is 80 years. If another man E, who is 3 years older than D replaces A, then the average age of B, C, D, E becomes 79 years. Then the age of A (in years) is