A family consists of grand parents, parents and three grand children. The average age of the grand parents is $67\, years,$ that of the parents is $35\, years$ and that of the grand children is $6 \,years.$ What is the average age of the family? (in $years$)
A family consists of grand parents, parents and three grand children. The average age of the grand parents is $67\, years,$ that of the parents is $35\, years$ and that of the grand children is $6 \,years.$ What is the average age of the family? (in $years$)
- A
$28 \frac{4}{7}$
- B
$31 \frac{5}{7}$
- C
$32 \frac{1}{7}$
- D
$29 \frac{4}{7}$
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