Answer:
The son is 5 years old.
Step-by-step explanation:
If the father is 7 times the age of a 5 year old the dad would be 35. In 25 years time the father will be 60 and in 25 years time his son will be 30. So the son will be half of his dads age and the dad will be twice the age of his son then. Hope this helps!