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The present average age of a family of 5 members is 40 years. If the youngest member of the family is 15 years old, then find the average age of the family at the time of birth of the youngest member.

32yrs

31 1/4yrs

33 2/3yrs

33yrs

Explanation:

Solution:
Present age of the family = 5*40 = 200 years.
15 years ago at the time of the birth of youngest member, age of family = 200 – 15*5 = 125.
So average age = 125/4 = 31 1/4 year

By: Pranav Gupta

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