The average age of group of eight members is the same as it was 3 years ago, when a young member is substituted for an old member. The incoming member is younger to the outgoing member by:

11 years 24 years 28 years 16 years

24 years

Given years = 3 Total members = 8 When the average is same then, he incoming member is younger to the outgoing member by = 8 × 3 = 24 years