The average age of 5 members of a family is 21. If the age of grandfather is included, the average age is increased by 9 years. What is the age of grandfather?
- 84
- 65
- 75
- 60
Explanation
Given:
- Average age of 5 members = 21
→ Total age of 5 members = 21 × 5 = 105
- When grandfather is included (6 members), average becomes 21 + 9 = 30
→ Total age of 6 members = 30 × 6 = 180
Now, Grandfather's age = 180 – 105 = 75 years
Last verified on 22-02-2026
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