The ratio of the ages of A and B is 4:5. After 5 years, the ratio will be 5:6. What is A's current age?
Q1. The ratio of the ages of A and B is 4:5. After 5 years, the ratio will be 5:6. What is A's current age?
Answer: 20
Explanation: Let A's age be 4x and B's age be 5x. Then, (4x + 5)/(5x + 5) = 5/6. Cross-multiplying gives 24x + 30 = 25x + 25, so x = 5. A's age = 4x = 20.