Correct option is A
There are 6 family members (including the father, Ramesh, and Ramesh's newborn son).
And the age of father be X
Total present age of family = Y+ 0
'0' is the age of the newborn child.
Total age of family member 10 years back = Y - 50 + X-10
The average age of the family is the same now as it was 10 years back
Therefore, Y+0= Y- 50+ X-10
X = Y-Y+ 60
X = 60
Hence, the age of the father is '60'years.