Question

A man is $5$ years older than his wife and the wife is now thrice as old as their daughter, who is $10$ years old. How old was the man when his daughter was born?

Answer 1

Given their daughter is $10$ years old.

Then according to the problem, the wife is $3\times 10=30$ years old.

Also the man is $30+5=35$ years old.

So, when their daughter was born the man was $35-10=25$ years old.