Problem related to average when new child born in family

Male child will be born if

The average age of a family of 6 members 4 year ago was 25 years. Mean while a child was born in this family and still the average age of the whole family is same today. The present age of child is :

The average age of a family of 6 members 4 years ago was 25 years meanwhile a child was born in this family and still the average age of the whole family is same today the present age of the child is:

Ten years ago, the ages of the members of a joint family of eight people added up to 231 years. Three years later, one member died at the age of 60 years and a child was born during the same year. After another three years, one more member died, again at 60, and a child was born during the same year. The current average age of this eight–member joint family is nearest to

A problem child is

Ten years ago, the ages of the members of a joint family of eight people added up to 231 years. Three years later, one member died at the age of 60 years and a child was born during the same year. After another three years, one more member died, again at 60, and a child was born during the same year. The current average of this eight-member joint family is nearest to (a) 21 years (b) 22 years (c) 23 years (d) 24 years (e) 25 years

The average age of Priyambada's family consisting of 5 members 3 years ago was 35 years. One years ago a new baby was born in this family. Three years hence the average age of the family will be :