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.
Er. Ashish Yadav said:
1 decade ago
Required average = 67 x 2 + 35 x 2 + 6 x 3.
-----------------------
2 + 2 + 3
= 134 + 70 + 18
---------------
7
= 222
-----
7
= 31 5 years.
-
7
Divide:
7)222(31
- 21
-------
12
- 7
-------
5
-------
so that is right it like 31 5
--------------------------
7
-----------------------
2 + 2 + 3
= 134 + 70 + 18
---------------
7
= 222
-----
7
= 31 5 years.
-
7
Divide:
7)222(31
- 21
-------
12
- 7
-------
5
-------
so that is right it like 31 5
--------------------------
7
(2)
Siva Subramania Krishnan S said:
1 decade ago
I have a question see they have given average age of parents is 35 but they didn't which parents, so grandparents are parents of the existing two parents rite.
Therefore there are totally 4 parents and the total age of parents should be (35*4) not (35*2) and the answer is none of the above.
My answer is 40 2/7.
Therefore there are totally 4 parents and the total age of parents should be (35*4) not (35*2) and the answer is none of the above.
My answer is 40 2/7.
Ankur Mishra said:
1 decade ago
As you are mentioning in question that 2 grandparents are there means 4 peoples (Because grandparent consists of 2 Members)and same as in parents 2 parents means 4 person again. Then i hope here total members are 11.
Hope it is correct if not please correct me
Hope it is correct if not please correct me
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.
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.
Kamal Jeet said:
9 years ago
According to Question : 2 Grandparents mean two members (Grandfather and Grandmother) Not mean to say (2 Grandfather or 2 Grandmother)!
And same follow as two Parents (Dad and Mom).
At Last 2 + 2 + 3 = 7.
I hope you understood.
And same follow as two Parents (Dad and Mom).
At Last 2 + 2 + 3 = 7.
I hope you understood.
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).
Tamilazhagan said:
1 decade ago
I think total members are 11. Because parent = mother and father. So 2 parents is equal for 2 mother and 2 father. Then grand parents are also 2 grand mother and 2 grand father. So total members are 11.
Rupinderjit said:
1 decade ago
(grandpa+granny)/2=67=134
(ma+pa)/2=35=70
(rinku+minku+chinku)/3=6=18
Now average age is(total age of all members/no of members) = 222/7(grandpa,granny,ma,pa,chinku,minku,rinku)
Hope it'll help you
(ma+pa)/2=35=70
(rinku+minku+chinku)/3=6=18
Now average age is(total age of all members/no of members) = 222/7(grandpa,granny,ma,pa,chinku,minku,rinku)
Hope it'll help you
Ranjani said:
11 months ago
Why is 31 5/7 is come?
Let's divide 31 by 7.
The answer is : Here the remainder 31 and the quotient is 5. So 31.5 and we need to mention the number of members so 7.
That's why the answer is 31.5/7.
Let's divide 31 by 7.
The answer is : Here the remainder 31 and the quotient is 5. So 31.5 and we need to mention the number of members so 7.
That's why the answer is 31.5/7.
Adithya said:
1 decade ago
@Shubham Sanware.
It is the mixed fraction of 222/7. When you divide 222 with 7 we get 31 as quotient and remainder 5.
Mixed fraction = quotient remainder/divisor.
So, its 31 5/7.
It is the mixed fraction of 222/7. When you divide 222 with 7 we get 31 as quotient and remainder 5.
Mixed fraction = quotient remainder/divisor.
So, its 31 5/7.
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