The average age of 9 people is 21 years. When one more person joins, the average rises by 1 year. What is…
The average age of 9 people is 21 years. When one more person joins, the average rises by 1 year. What is the age of the new person?
Answer and solution
Correct answer: A) 31 years
New total = 10 × 22 = 220; old total = 9 × 21 = 189; new person = 31 years.
Learn the method: Averages rules and worked examples · SSC CGL Tier 1 Quantitative Aptitude
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