Question

A man is 10 years older than his wife and the wife is now twice as old as their daughter who is 15 years old how old was the man when his daughter was born

Answer 1

given
man's age=10+y
wife's age=2×15=30
daughter 's age=15

wife's age=30
so, the age man=10+30=40

age of the man when his daughter was born (before 15 years) =40-15=25 years

hope it helps .....