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?
Answer: Option
Explanation:
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Video Explanation: https://youtu.be/OXLnoItd0MA
Discussion:
69 comments Page 2 of 7.
Iqra said:
1 decade ago
Numbers of children is not mentioned here?
Naina said:
1 decade ago
Exactly no.of children is not given then how 3 is taken?
H.R said:
1 decade ago
They are mention three grandchildren observe the problem again.
Krishna said:
1 decade ago
@Eric: The numbers are not equal, grandparents are 2, parents are also 2 but children are 3. so don't take avg figure.
Grand parents avg age of 2 = 67, but 2 people are there so 67*2.
Parents avg age of 2 = 35, 2 people are two so 35+35 or 35*2.
Children are 3 avg age = 6, people are three so 6+6+6 or 6*3.
If in the question if he said children also two then you can take avg directly.
Grand parents avg age of 2 = 67, but 2 people are there so 67*2.
Parents avg age of 2 = 35, 2 people are two so 35+35 or 35*2.
Children are 3 avg age = 6, people are three so 6+6+6 or 6*3.
If in the question if he said children also two then you can take avg directly.
Naani said:
1 decade ago
It's so simple.
A = S/N.
S = A*N.
Total Sum = (2*67)+(2*35)+(3*6) = 222.
Number of people in that family = 2+2+3 = 7.
So Average=Total Sum/Num of people.
A = 222/7.
A = 31 5/7. ((7*31)+5 =222/7).
A = S/N.
S = A*N.
Total Sum = (2*67)+(2*35)+(3*6) = 222.
Number of people in that family = 2+2+3 = 7.
So Average=Total Sum/Num of people.
A = 222/7.
A = 31 5/7. ((7*31)+5 =222/7).
Yatin said:
1 decade ago
Consider, Average age of grandparents is given i.e. avg = 67.
Also number of grandparents = 2.
By definition of average.
Average = total observations of all objects/total no of objects.
Let sum of individual ages of grandparents = X.
In this case,
Substituting in above formula,
67 = X/2.
Hence, X = 67x2.
And rest is average concept.
Thanks :).
Also number of grandparents = 2.
By definition of average.
Average = total observations of all objects/total no of objects.
Let sum of individual ages of grandparents = X.
In this case,
Substituting in above formula,
67 = X/2.
Hence, X = 67x2.
And rest is average concept.
Thanks :).
Rabindra gouda said:
1 decade ago
Total member of the family is 11. How it 7?
RASHMI PODDAR said:
1 decade ago
Parents are grandparents means 2 people then 2 grandparents are parents means 4 nd 4 people respectively then how its here only 2 people for grandparents and parents?
Nilin said:
1 decade ago
But I wanted to know how it comes from 222/7 to 31 5/7?
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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