The average age of 8 people is 20 years. When one more person joins, the average rises by 1 year. What is…
The average age of 8 people is 20 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: D) 29 years
New total = 9 × 21 = 189; old total = 8 × 20 = 160; new person = 29 years.
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