SSC Steno Grade C and D 18 Nov 2022 Shift 1 Paper

I, J, K, L, M, N and O are seven friends having different ages. I is elder than K but younger than J. K is elder than N but younger than I. J is elder than I but younger than 2 persons. L is elder than J. M is not the eldest and O is the youngest. The age of how many people is between I and N?