The age of the grandfather is 75 years. The total age of the initial 5 family members is 5times 21=105 years. When the grandfather is included, there are 6 members, and the new average age is 21+9=30 years. The new total age is 6times 30=180years, and the grandfather's age is the difference between the new total and the original total, which is 180-105=75 years.
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?
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Question context
This question is part of 📏 Arithmetic Aptitude within the broader 🧠 Aptitude Mastery subject and appears in the PPSC Punjab Public Service Commission preparation collection. Reviewing the answer together with nearby questions helps reinforce the underlying concept and identify how it may appear in competitive exams.