The average age of 3 children in a family is 20% of the average age of the father and the eldest child. The total age of the mother and the youngest child is 39 years. If the father's age is 26 years. What is the age of the second child?  Select.
A) 15 years
B) 16 years
C) 18 years
D) Cannot be determined
E) None
Solution   Since the total or average age of all the family members is not given, the given data is inadequate. So, the age of second child cannot be determined.   Answer Cannot be determined
<result>D</result>
The average age of 3 children in a family is 20% of the average age of the father and the eldest child. The total age of the mother and the youngest child is 39 years. If the father's age is 26 years. What is the age of the second child?