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### The average age of a family of 10 members is 20 years. If the age of the youngest member of the family is 10 years, then the average age of the members of the family just before the birth of the youngest member was approximately.

- A. 27.14 years
- B. 12.5 years
- C. 14.28 years
- D. $$11\frac{1}{9}$$ years

**Answer: Option D **

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