Multiple choice

Four years ago, the average of a 4 member family was 40 years. 3 years ago, a boy got married to a 23 years old girl, and they had a baby boy last year. what is the average of the family 2 years from now assuming no one joins or leaves from the family in the next 2 years.

  1. $40$
  2. $42.5$
  3. $36.5$
  4. $34$
  5. $35.8$
Reveal answer Fill a bubble to check yourself
E Correct answer
Explanation

4 years ago: sum = 160. 3 years ago: sum = 164, then add 23 (wife) = 187. Last year: sum = 198 + 1 (baby) = 199. Now: sum = 209. In 2 years: sum = 209 + 14 = 223. Average = 223/6.25 = 35.8. Option E is correct.