(b) Let the average age of 8 men = x yr Total age of 8 man = 8x yr Now, new average age = x + 2 yr Total age = 8 {x + 2) yr Difference of ages = 8 (x + 2 ) - 8x = 8x + 16 -8x = 16 yr ∴ Age of new man = 20 + 16 = 36 yr So, the new man is 16 yr older to the man by whom the new man is replaced.