Two grandparents, two parents, and three grandkids make up a family. The grandparents are on average 67 years old, the parents are 35 years old, and the grandchildren are 6 years old. What is the family's average age?
A. 28 4/7years
B. 31 5/7years
C. 32 1/7years
D. None of these
Answer:B
Two grandparents, two parents, and three grandkids make up a family. The grandparents are on average 67 years old, the parents are 35 years old, and the grandchildren are 6 years old. What is the family's average age?
A. 28 4/7years B. 31 5/7years C. 32 1/7years D. None of these
Explanation: Average required = 67 x 2 + 35 x 2 + 6 x 3/ 2 + 2 + 3,134 + 70 + 18/7 = 134 + 70 + 18/7= 222/7= 31 5/7 years old