The average age of 6 people is 55 years. When one more person joins, the average rises by 2 years. What is…
The average age of 6 people is 55 years. When one more person joins, the average rises by 2 years. What is the age of the new person?
Answer and solution
Correct answer: A) 69 years
New total = 7 × 57 = 399; old total = 6 × 55 = 330; new person = 69 years.
Learn the method: Averages rules and worked examples · SSC CGL Tier 1 Quantitative Aptitude
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