Multiple choice

The average ages of parents and two children are 30 years and 8 years respectively. The average age of the family is-

  1. 16 years

  2. 19 years

  3. 18 years

  4. 17 years

Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Parents' total age = 30 × 2 = 60 years. Children's total age = 8 × 2 = 16 years. Family total age = 60 + 16 = 76 years. Family average = 76/4 = 19 years. The calculation combines weighted averages of two subgroups.