Multiple choice

The average age of a family of 6 members is 25 years. If the age of the youngest member be 5 years, the average age of the family at the birth of the youngest member was?

  1. 18 years

  2. 24 years

  3. 23 years

  4. 22 years

  5. None of these
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Current total age = 6 * 25 = 150 years. Youngest is 5 years, so 5 years ago total age = 150 - (6 * 5) = 120 years. But at that time, the youngest wasn't born, so there were only 5 members. Average = 120/5 = 24 years.

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