The present age of a father is 3 times that of his son. Five years ago, the father's age was 4 times the age of his son. What is the present age of the son?
Q1. The present age of a father is 3 times that of his son. Five years ago, the father's age was 4 times the age of his son. What is the present age of the son?
Answer: 15 years
Explanation: Let son's current age = x; father = 3x; five years ago 3x − 5 = 4(x − 5), giving x = 15 years.