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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:
71 comments Page 8 of 8.
Navi said:   1 decade ago
Sorry I wanted also to know how it comes from 222/7 to 31 5/7?
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