The sum of the ages of a father and son is 45. Five years ago, the father's age was 4 times that of the son. What is the present age of the son?
Q1. The sum of the ages of a father and son is 45. Five years ago, the father's age was 4 times that of the son. What is the present age of the son?
Answer: 11 years
Explanation: Let's denote son's age 5 years ago as x. Then, father's age 5 years ago = 4x. So, x + 4x = 45 - 10, 5x = 35, x = 7.