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The average age of an 8-member committee is 40 years. A member aged 55 retires and is replaced by a new member, after which the average is 38.5 years. How old is the new member?

Competition practiceStatistics
  • A48
  • B43
  • C40
  • D67

Step-by-Step Solution

Total falls from 320 to 308, i.e. by 12. So the new member is 12 years younger than 55: 43. (67 adds the 12 instead.)
Answer: B) 43

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