The average age of 5 members of a family is 20 years. If a new member joins the family, the average age becomes 18 years. What is the age of the new member?
Show answer & explanation
Correct answer: C
Explanation
Total age of 5 members = 20 × 5 = 100 years
Total age of 6 members = 18 × 6 = 108 years
Age of the new member = 108 - 100 = 8 years