Nov 8, 2006
By: Caroline Latham
Marie, Claude, and Jean are in a competition. Here are their results:
- The youngest person received the least points.
- Claude got half of the points of the eldest.
- Jean received as many points as both others combined.
Who is the eldest ?
The Brain Exercise:
This puzzle uses planning and reasoning skills. You read the statements and then must develop a plan to solve the problem using your reasoning skills. These skills are found predominantly in your prefrontal cortex. This area of your brain is responsible for executive functions such as planning, structuring, and evaluating voluntary, goal-directed behavior, i.e., activities requiring the constant comparison of planned acts with the effects achieved.
If you’ve already got the puzzle figured out, click on the link below to find the answer.
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.