Three years ago, the average of a family of 6 members was 18 years. A baby having been born, the average of the family is the same today. What is the age of the baby?
- A. 1 year
- B. 2 years
- C. 3 years
- D. 0 year
The correct answer is option D. 0 year. Can you explain this answer in the comments?
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