Let the age of new comer be x
Avg age decrease by 1/12 year ?24 X 1/12 = 18 ?x
?x=16 years
The present age of Father (f) = 48 and present age of son (s) = 28.8
The age of father at his sons birth is 48 - 28.8 = 19.2
Therefore the age of father was 2/3rd of his son's age at the time of his sons birth
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