A three-digit locker code at ISSB uses all different digits. The sum of the first and last digits equals the middle digit. The code is greater than 400 but less than 500, and the middle digit is 6. What is the code?
Q1. A three-digit locker code at ISSB uses all different digits. The sum of the first and last digits equals the middle digit. The code is greater than 400 but less than 500, and the middle digit is 6. What is the code?
Answer: 462
Explanation: The middle digit is 6 and the first digit must be 4 to stay between 400 and 500. Since 4 plus the last digit equals 6, the last digit is 2, giving 462.