The average age of a family of 18 members is 82 years.

If the age of the youngest member is 12 years, what was the average age of the family just before the birth of the youngest member?

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The average age of a family of 18 members is 82 years.

If the age of the youngest member is 12 years, what was the average age of the family just before the birth of the youngest member?

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