Multiple choice

Average age of seven person in a group is 30 years, the average age of five person of this group is 31 years. What is the average age of the other two persons in the group?

  1. 15 years

  2. 26 years

  3. 55 years

  4. None of these
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Total age of 7 persons = 7 × 30 = 210 years. Total age of 5 persons = 5 × 31 = 155 years. Age of remaining 2 persons = 210 - 155 = 55 years. Average age of these 2 persons = 55/2 = 27.5 years. Since 27.5 years is not among options A, B, or C, the correct answer is 'None of these'.

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