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 ?

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 ?
1). 17 yeasr 3 months
2). 18 years 4 months
3). 17 years 5 months
4). 18 years 3 months

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