If three years ago the average age of a family of 6 members was 19 years. A baby having been born, the average age of the family now remains the same.The age or baby in years is

11-Feb
1
2
none of the above

The correct answer is (b).

The total age of the family three years ago was $6 \times 19 = 114$ years. The total age of the family now is $114 + 3 \times 6 = 126$ years. The total age of the family including the baby is $126 + 1 = 127$ years. The baby is 1 year old.

Option (a) is incorrect because 11/2 is not an integer.

Option (c) is incorrect because 2 is not an integer.

Option (d) is incorrect because the baby is 1 year old.

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