Answer:

12?

Explanation:

4 grandfather's

4 fathers

4 sons

4+4+4= 12

4×3= 12

Answer:

Four (4) chairs

Explanation:

Read the problem carefully. It doesn’t say a word about whether one individual can fulfill more than one filial or paternal role. It only asks the minimum number of chairs to seat four fathers, four sons, and two grandfathers.

A father is also a son.

A grandfather is a also a father and a son.

We know we have two chairs reserved for grandfathers. So that is two each of grandfathers, fathers and sons.

Now we need to seat two fathers and two sons. Since each father is a son, two more chairs are required.

So two chairs each for two grandfathers and two more for fathers are the minimum number of chairs that can seat four fathers, four sons, and two grandfathers.

2+2=4