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? December 31, 2021December 31, 2021 administrator A. 28 4/7 yearsB. 31 5/7 yearsC. 32 1/7 yearsD. None of theseCheck AnswerB. 31 5/7 years Share the PostRelated Posts:A family consists of two grandparents, two parents…Three years ago the average age of a family of six…The average age of a husband and a wife is 23 years…The average age of 15 students of a class is 15…The average age of a husband, wife and their child 3…Five years ago the average of the ages of A and B…