Hum... Being 5-3-2 (10) The last son, having 2, knows for sure that it's 5-3-2, it cannot be 4-4-2, 6-2-2, nor 7-1-2. Being 5-4-1 (10) The second son, having 4, knows for sure it's 5-4-1, it cannot be 6-4-0 Being 5-3-1 (9) The first son, having 5, knows for sure it's 5-3-1, it cannot be 5-4-0 nor 5-2-2 Being 6-2-1 (9) The middle son, having 2, knows for sure it's 6-2-1, it cannot be 7-2-0, nor 5-2-2 If the middle son cannot have as much sheep as it's brothers, maybe he just doesn't have sheep? So the first son knows that his brother has (X - the numbe of sheeps he owns). JFarceur