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Aptitude - Average - Discussion

Discussion Forum : Average - General Questions (Q.No. 2)
Average
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:
69 comments Page 7 of 7.
Shubham sanware said:   1 decade ago
Can you explain 31 5/7 with formula ?
Shubham j said:   7 years ago
Thanks for the answer @Rupinderjit.
Rutvik said:   2 years ago
How come 5/7? Please explain to me.
(5)
Changlu said:   1 decade ago
How comes 5/7 I got 31.7142?
Steffi said:   1 decade ago
In the answer how 6x3 came?
Fazin mohammed said:   1 year ago
How come 5/7? Explain it.
(7)
Rjay said:   6 years ago
Why is 31 5/7 is come?
(5)
Spvn said:   8 years ago
Thanks @Rupinderjit.
Sarath said:   1 decade ago
Thank you swathi.
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