The average age of a husband and his wife was 23 years at the time of their marriage. After five years they have a one-year old child. The average age of the family now is (a) 19 years (b) 23 years (c) 28.5 years (d) 29.3 years

The average age of a husband and a wife was 27 years when the child was born. The average age of the husband, the wife and a new-born child is 21 years now. The present age of the child is :

The average age of husband, wife and their child 3 years ago was 27 years and that of wife and the child 5 years ago was 20 years. The present age of the husband is (a) 35 years (b) 40 years (c) 50 years (d) None of these

Four years ago, the average age of a family of four persons was 18 years. During this period, a baby was born. Today if the average age of the family is still 18 years, the age of the baby is (a) 1.2 years (b) 2 years (c) 2.5 years (d) 3 years

A family consists of grandparents,parents and three grandchildren.The average age of the grandparents is 67 years,that of the parents is 35 years and that of the grandchildren is 6 years.What is the average age of the family? 28(4)/(7) years (b) 31(5)/(7) years (c) 32(1)/(7) years (d) None of these