Multiple choice

The average age of a group of 7 members is 62 years. If one of the members leaves the group the average reduced by a year. Find the age of the member who leaves the group.

  1. 55 years

  2. 68 years

  3. 62 years

  4. 70 years
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Total age of 7 members = 7 × 62 = 434 years. After one leaves, 6 members have average 61 years, so total = 366 years. Age of person who left = 434 - 366 = 68 years. The answer correctly uses the concept that the difference in total ages before and after gives the age of the person who left.

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