Civil Service Exam Reviewer · Averages · hard
The average age of 9 committee members increases by 2.5 years when a member aged 59 is replaced by a new member. How old is the new member?
- 61.5 years old
- 79 years old
- 84 years old
- 81.5 years old
Answer
D. 81.5 years old
Solution
Total age rises by 9 × 2.5 = 22.5. New member = 59 + 22.5 = 81.5.
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