3 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 ?  Select:  A) 3  B) 2  C) 4  D) 1  E) 5

Rationale: present age of 5 members = 5 x 17 + 3 x 5 = 100 years also , present ages of 5 members + age of the baby = 6 x 17 = 102 years age of the baby = 102 – 100 = 2 years . answer : b
Answer: B