What is the Average Age of the Family? If

A family consists of two grandparents, two parents and three children. The average age of the grandparents is 67 years, that of the parents is 35 years and that of the children is 6 years. What is the average age of the family?

  1. 28(4/7) years
  2. 31(5/7) years
  3. 32 (1/7) years
  4. None of these
Desire Adnan Default Asked on 5th August 2015 in Maths.
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1 Answer(s)

Answer: (2) 31 (5/7) years
Explanation:-
The average age of two grandparent = 67 years
Then, the sum of their age = 67 x 2 = 134 years

The average age of two parents  = 35 years
Then, the sum of their age = 2 x 35 = 70 years

The average age of their three children = 6 years
Then, the sum of their three children = 6 x 3 = 18 years

The total age of the all family members = 134  + 70 + 18
= 222 years
Then, the average of the family members = 222 / (2 + 2 + 3)
= 222/7
= 31 (5/7 ) years

Then, the average age of all family members is 31 (5/7) years.
Hence, the answer is (2) 31 (5/7) years.

Anurag Mishra Professor Answered on 5th August 2015.
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