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 child is ......

Q. 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

Q. Eleven years earlier the average age of a family of 4 members was 28 years. Now the age of the same family with six members is yet the same, even when 2 children were born in this period. If they belong to the same parents and the age of the first child at the time of the birth of the younger child was same as there were total family members just after the birth of the youngest members of this family, then the present age of the youngest member of the family is:

Q. Emma, who is the second-youngest, is 12 years old and has 7 members in her family. Her younger brother is 10 years old. The average age of her family is 25 years. Find the average age of the family just before Emma was born.

Q.

The average age of a family of 6 members is 24 years. If the age of the youngest member be 6 years, then what was the average age of the family member at the birth of the youngest member (in years)?