Three years ago, the average age of a family of 5 members was 17. A baby having been born the average age of the family is the same today? What is the age of the child?

A. 3 years
C. 2 years
B. 5 years
D. 1 year
Answer : C

Explanation :

Present age of 5 members = 5 x 17 + 3 x 5 = 100 years
Also, present ages of 5 members + Age of the baby = (5+1) x 17
                                                  = 102 years
   Age of the baby = 102 – 100 = 2 years.