If the average life of a person is taken as 100S the age of the universe on this scale is of the order
The average age of n persons is 55.Two persons aged 41 and 47 respectively leave the group and three new persons aged between 60 and 65 join the group. If the average age of the group goes up by one year and if the initial number of people in the group is a multiple of 7, what is the number of persons now in the group?