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What was the average age of the family at 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?

posted Nov 11, 2020 by Nimish

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1 Answer

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74 years
.
The total # of years now = 18 * 82 = 1476 years.
12 years ago this was = 1476 - 18*12 = 1260 years.
Divided over 17 members gives 1260 / 17 = 74.1 years

answer Nov 13, 2020 by Jcm



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