We assume wise man's age is x years…and 3 times his age will be 3x as per the simple calculation..
Wise man gives you second hint… from 400 , reduce thrice my age and you will get 163..
Let's try again…
Now the equation becomes :-
400 - 3x = 163
400–163 =3x
237 = 3x or 3x = 237 or x = 79…
The wise person looks to be experienced too with current age of 79 years… ☺️.
(This isn’t mine, I found it on Quora by Manish Raj)