The average age of a family of 11 members is 20 yrs. If the age of youngest member be 9 years, then what was the average age of the family at the birth of the youngest member?
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Answer:
The average age of family members at the birth of youngest member was 21.1 years.
Step-by-step explanation:
The total sum of ages of 11 family members = 20 × 11 = 220
Given age of youngest member = 9 years
So, The total sum of ages of 10 family members = 220 - 9 = 211
Average of ages of 10 family members = 211/10 = 21.1 years
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