Vậy số tuổi của Bob và Jonh là bao nhiêu?
Để bạn đọc hiểu đề cho rõ, không nhầm lẫn, chúng tôi để cả nguyên văn tiếng Anh: Bob and John form a team together. Bob is as old as John will be when Bob is twice as old as John was when Bob was half as old as the sum of their current ages. John is as old as Bob was when John was half as old as he will become over ten years.
How old are Bob and John?
TS Trần Nam Dũng
ĐH Khoa học tự nhiên, ĐH quốc gia TP HCM