Start with statement #2 which tells us that Claude is not the eldest. So the eldest must be either Marie or Jean. Statement #3 tells us that Jean received the sum of the other two people's points, and those point totals are not equal, per statement #1 (the youngest has less points than the other two). For Jean to be the eldest, Claude and Marie would each have half of the points of Jean has, but we know they can't have the same amount of points. Therefore, Jean must have the most points, and Claude must be the youngest, but Marie is the eldest.