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 4 of 7.
Faizal Hussain said:
1 decade ago
Please explain, why for parents also your multiplying by 2 and for two grandparents also multiplying by 2. Why can't we consider like this.
For parents means = Father and mother, hence its multiplied by 2.
For 2 grandparents means = Father's father, father's mother, mother'father, mothers mother, hence it should be 4.
Please some one reply am I right or wrong, if no please explain.
For parents means = Father and mother, hence its multiplied by 2.
For 2 grandparents means = Father's father, father's mother, mother'father, mothers mother, hence it should be 4.
Please some one reply am I right or wrong, if no please explain.
Changlu said:
1 decade ago
How comes 5/7 I got 31.7142?
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)
Ramesh said:
1 decade ago
How the 5 is coming? Can anyone explain what is remainder?
Masterneeji said:
1 decade ago
@Tamilazhagan.
Parent means either mummy or daddy.
Parents means couple so we (67*2+35*2+6*3)/2+2+3 = 222/7 = 31 5/7.
Parent means either mummy or daddy.
Parents means couple so we (67*2+35*2+6*3)/2+2+3 = 222/7 = 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.
Shubham sanware said:
1 decade ago
Can you explain 31 5/7 with formula ?
Kraminka said:
1 decade ago
Average = Sum of total ages/No of person.
Average = 67*2+35*2+6*3/2+2+3.
= 134+70+18/7 = 222/7 = 31 5/7.
Average = 67*2+35*2+6*3/2+2+3.
= 134+70+18/7 = 222/7 = 31 5/7.
Dhivya R said:
1 decade ago
Your calculation wrong @Mr.Siva.
Because the given question is 2 grandparents, 2 parents, 3 grandchildren.
Average age of grandparents is 67. So age of two grandparents is 67*2 = 134. Average age of parents is 35. So age of two parents is 35*2 = 70. Average age of three grandchildren is 6. So age of three grandchildren is 6*3 = 18.
Average = Sum of observation/Number of observation.
Average = 134+70+18/2+2+3.
Average = 222/7.
We convert ordinary fraction into mixed fraction.
So finally we get average = 31 5/7.
Because the given question is 2 grandparents, 2 parents, 3 grandchildren.
Average age of grandparents is 67. So age of two grandparents is 67*2 = 134. Average age of parents is 35. So age of two parents is 35*2 = 70. Average age of three grandchildren is 6. So age of three grandchildren is 6*3 = 18.
Average = Sum of observation/Number of observation.
Average = 134+70+18/2+2+3.
Average = 222/7.
We convert ordinary fraction into mixed fraction.
So finally we get average = 31 5/7.
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.
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