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### The average age of 10 children is 9 years 9 months. The average of 9 children is 8 years 11 months. What is the age of the tenth child ?

- A. 17 years 3 months
- B. 18 years 4 months
- C. 17 years 5 months
- D. 18 years 3 months

**Answer: Option A **

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