A family consists of grandparents parents and three grandchildren The average…

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A family consists of grandparents, 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?

  1. A. $$28\frac{4}{7}{\text{ years}}$$
  2. B. $$31\frac{5}{7}{\text{ years}}$$
  3. C. $$32\frac{1}{7}{\text{ years}}$$
  4. D. None of these

Answer: Option B

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Solution(By ExamCraze Team)

Required average
$$eqalign{ & {text{ = }} {frac{{67 times 2 + 35 times 2 + 6 times 3}}{{2 + 2 + 3}}} cr & {text{ = }} {frac{{134 + 70 + 18}}{7}} cr & = frac{{222}}{7} cr & = 31frac{5}{7}{text{ years}} cr} $$

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