On a playground, some men were playing football. In that group, 5 men were grandfathers of
someone else in the group, 15 men were fathers of someone else in the group and 15 men were
sons of someone else in the group. What is the minimum number of men on the playground?

Asked by chandubeats21 | 21st May, 2017, 01:38: PM

Expert Answer:

n(A) = 5 grandfathers
 
Now, from 15 fathers, there is a possibility of 5 grandfathers,
So, n(B)= 15- n(A) = 10 fathers
 
But from 15 fathers, there is a possibility of 5 sons which we will be excluding from the 15 sons.
So, n(C)= 15- n(B)= 10 sons
 
So, total number of men playing fotball= 5+10+10=25

Answered by Sivanand Patnaik | 22nd May, 2017, 12:45: PM