Correct Answer - Option 3 : 58
The average age of Ramesh and Mahesh is 42.
Sum of ages of Ramesh and Mahesh = 84
Amit′s age + Mahesh′s age + Ramesh′s age = 108
Amit′s age = 108 – 84 = 24
Mahesh is three years younger than Amit,
Therefore, Mahesh′s age = 21
Ramesh′s age = 84 – 21 = 63
Ramesh′s age on 1st January, 2010 is = 63 - 5 = 58.
Hence, the correct answer is 58.