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- A family consists of two grandparents, two parents and three grandchildren.
Question 1:
A family consists of two grandparents, two 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?
A. 28 ( 4 / 7 ) years
B. 31 ( 5 / 7) years
Feedback The family consists of two grandparents, two parents and three grandchildren
The average age of two grandparents = 67 years.
=> Total age of two grandparents = (67 * 2) = 134 years
The average age of two parents = 35 years
=> Total age of two parents = (35 * 2) = 70 years
The average age of three grand children = 6 years.
=> Total age of three grand children = (6 * 3) = 18 years.
Required Average age of the family = Total age of (two grandparents + two parents + three grand children) / Total members in the family
= ( 134 + 70 + 18 ) / (2 + 2 + 3)
= 222 / 7
= 31 (5 / 7) years
The average age of two grandparents = 67 years.
=> Total age of two grandparents = (67 * 2) = 134 years
The average age of two parents = 35 years
=> Total age of two parents = (35 * 2) = 70 years
The average age of three grand children = 6 years.
=> Total age of three grand children = (6 * 3) = 18 years.
Required Average age of the family = Total age of (two grandparents + two parents + three grand children) / Total members in the family
= ( 134 + 70 + 18 ) / (2 + 2 + 3)
= 222 / 7
= 31 (5 / 7) years
C. 32 ( 1 / 7 ) years
D. Cannot be determined
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