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The average age of 6 sisters is 30 yr. If the age of the youngest sister be 5 yr. What was the average age of the group of sisters just before the birth of the youngest sister?

The average age of 6 sisters is 30 yr. If the age of the youngest sister be 5 yr. What was the average age of the group of sisters just before the birth of the youngest sister? Correct Answer 30 years

Total age of 6 sisters = 30 × 6 = 180 years

5 years ago,

Total sum of ages = 180 - (5 × 6) = 150 years

But at that time (5 years ago), there were 5 sisters in the group

∴ Average age at that time (5 years ago) = 150/5 = 30 years

Hence, the required answer is 30 years

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