Aptitude - Average - Discussion

Discussion Forum : Average - General Questions (Q.No. 2)
2.
A family consists of two grandparents, two 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?
28  4 years
7
31  5 years
7
32  1 years
7
None of these
Answer: Option
Explanation:
Required average
= 67 x 2 + 35 x 2 + 6 x 3
2 + 2 + 3
= 134 + 70 + 18
7
= 222
7
= 31  5 years.
7

Video Explanation: https://youtu.be/OXLnoItd0MA

Discussion:
66 comments Page 7 of 7.

Swati said:   1 decade ago
There are 2 grandparents of 67yrs (67*2)
2 parents of 35yrs (35*2)
3 grandchildren of 6yrs (6*3)
average = sum of total ages/no.of persons
67 x 2 + 35 x 2 + 6 x 3 divided by 2 + 2 + 3
=31 5/7
Hope that explains if not plz correct me.

Steffi said:   1 decade ago
In the answer how 6x3 came?

Eric said:   1 decade ago
When already the avg ages of grandparents, parents and children are given! why they have been multiplied by 2, 2 and 3 respectively?

Moreshwar pidadi said:   1 decade ago
No because in question it is givven an avarage an no. Of person so answer seams to be correct an each age is being taken out.

Sanjana said:   1 decade ago
It's remainder.

While we perform 222/7 quotent will be 31 nd remainder would be 5.

Anonymous said:   1 decade ago
In the answer how 5 comes can someone tell me.


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