Aptitude - Average - Discussion

No because in question it is givven an avarage an no. Of person so answer seams to be correct an each age is being taken out.

It's remainder.

While we perform 222/7 quotent will be 31 nd remainder would be 5.

I wanted to know how it comes from 222/7 to 31 5/7?

@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.

Can you explain 31 5/7 with formula ?

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.

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.

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.

That's current value is not better for this question.

@Tamilazhagan

Yes you are correct that is the correct process and answer is none of these.