Answer : Option B
Explanation :
$MF#%\begin{align}
&\text{Total age of the grandparents = }67 \times 2\\\\
&\text{Total age of the parents = }35 \times 2\\\\
&\text{Total age of the grandchildren = }6 \times 3\\\\
&\text{Average age of the family = }\dfrac{\left(67 \times 2\right) + \left(35 \times 2\right) + \left(6 \times 3\right)}{7}\\\\
&= \dfrac{134+70+18}{7} = \dfrac{222}{7} = 31 \dfrac{5}{7}
\end{align} $MF#%
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