A man is 4 times as old as his son. In 20 years, he will be twice as old as his son. What is the man's current age?
Q1. A man is 4 times as old as his son. In 20 years, he will be twice as old as his son. What is the man's current age?
Answer: 40 years
Explanation: Let's denote the son's age as x. Then, the man is 4x. In 20 years, 4x + 20 = 2(x + 20), simplifying to 4x + 20 = 2x + 40, so 2x = 20, and x = 10. Thus, the man is 4x = 40 years old.