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(B) The family consists of $2$ grandparents,$2$ parents,and $3$ grandchildren,making a total of $2 + 2 + 3 = 7$ members.Total age of the grandparents

Vedclass · Accepted Answer

$31 \frac{5}{7}$

Vedclass · Answer

(B) The family consists of $2$ grandparents,$2$ parents,and $3$ grandchildren,making a total of $2 + 2 + 3 = 7$ members.Total age of the grandparents $= 2 	imes 67 = 134 	ext{ years}$.Total age of the parents $= 2 	imes 35 = 70 	ext{ years}$.Total age of the grandchildren $= 3 	imes 6 = 18 	ext{ years}$.Total age of the family $= 134 + 70 + 18 = 222 	ext{ years}$.Average age of the family $= \frac{	ext{Total age}}{	ext{Total number of members}} = \frac{222}{7} = 31 \frac{5}{7} 	ext{ years}$.

$A$ family consists of grandparents,parents,and three grandchildren. The average age of the grandparents is $67 \text{ years}$,that of the parents is $35 \text{ years}$,and that of the grandchildren is $6 \text{ years}$. What is the average age of the family? (in $\text{years}$)

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