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Four cousins have an average age of 30 years. Three of them are 27, 28 and 31. How old is the fourth?

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Question: Four cousins have an average age of 30 years. Three of them are 27, 28 and 31. How old is the fourth?

  1. 35 years
  2. 34 years
  3. 33 years
  4. 36 years

Correct Answer: B — 34 years

Explanation: The combined age is average × four; subtract the three given ages.
Fourth age = 4 × 30 − 27 − 28 − 31 = 34 years.

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