Aptitude - Average - Discussion

When already the avg ages of grandparents, parents and children are given! why they have been multiplied by 2, 2 and 3 respectively?

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 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.

@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.

@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.