In the darkroom, you are handed a deck of cards.

This task was once popular at interviews in JP Morgan Chase. Surely, once in the darkroom, you will just take your smartphone and use the screen or a flashlight. However, this task had created before the era of smartphones and can be solved without observing the cards.   With an imperious deck division, it…

How far can you deliver cargo using N trucks?

You have a fleet of 50 trucks. Each of them is fully fueled and can cover 100 km. How far can you deliver a certain item with their help? What will be the formula if you have N trucks at your disposal?   Not all people understand what is the task about: geographically…

In what situation you will get less wet getting to the car

It is raining, but you need to get to your car, which stands at the farthest end of the parking lot.  Will you run to it or not, if your goal is to get wet as little as possible? How will you behave if you have an umbrella?   In order to answer this…

You are given three boxes

You are given three boxes: one of them contains a valuable prize, others contain nothing. You can choose any box, but you still do not know exactly where is the prize. One of the two boxes you have not selected will be opened and shown that it is empty. Currently, you can either leave…

You are given three boxes

You are given three boxes: one of them contains a valuable prize, others contain nothing. You can choose any box, but you still do not know exactly where is the prize. One of the two boxes you have not selected will be opened and shown that it is empty. Currently, you can either leave…