Average age of 2 brothers and 1 sister= 15 years Father's age is 41 years, average age of the family is 25 years, what is mother's age?
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The average age of a family of 5 members = 24 years.
Sum of the ages of the 5 members = 5*24 = 120 years.
The youngest member is 8 years now.
8 years ago their total age was 120–8*5 = 80.
The average age of the 4 members 8 years ago = 80/4 = 20 years.
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