The average age of a family with 5 members is 28 years.

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The average age of a family with 5 members is 28 years. If one of the members of age 20 years is excluded, the average age of the family becomes

1. 25 years
2. 20 years
3. 30 years
4. 24 years

Correct Option: C

Here , The average age of 5 members = 28 years.
Age of replaced one member = 20 years
Sum of the ages of 4 members of family = (28 × 5 – 20) years
Sum of the ages of 4 members of family = (140 – 20) years = 120 years
∴ Required average = 120 ÷ 4 = 30 years