A is older than B by 5 years. 10 years ago, A's age was double that of B's. What is A's present age?
Q1. A is older than B by 5 years. 10 years ago, A's age was double that of B's. What is A's present age?
Answer: 15 years
Explanation: Let A's age = x, B's age = x - 5. 10 years ago, x - 10 = 2(x - 5 - 10), solving gives x = 15 + 10 - 10 = 15.