The average of 5 members of a family is 24 years If the youngest member is 8 years old then what was...........

Quantitative Aptitude (CGL) Average

The average of 5 members of a family is 24 years. If the youngest member is 8 years old, then what was the average age (in years) of the family at the time of the birth of the youngest member?

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Explanation:

Total ages of five member=120
Age of youngest member=8
8 years ago the ages of 4member=120-(8×5)=80
Now,
The average ages of 4 member at the birth of youngest =80÷4=20.