In a cube is much more than you think. You can share it for example with a straight cut into two halves so that the cut face is an equilateral triangle. As the sectional area of a...
The Problem of the frogs and toads is described. Each animal sits on a floating leaf, just the leaf in the middle is not occupied (see below). The brown toads want to bounce to the left, the...
conundrums with watches it was at this point already a few. About the question of when, for the first Time after 12:00 PM the big and the little hand exactly on top of each other. Tip: The...
When a wheel rotates fast, it should have better balance. Because otherwise it could run out-of-round. In the case of car small tire on the edge of the rim-mounted pieces of metal that the wheel is hitting....
The job sounds simple: memory is not expanding, more. But when you look into the case shows that the monster fan blocks the slot. I cap so the power cable, remove the fan, pull out the old...
Two beautiful grass courts of the football club, but the constant Mowing of the way to get the members. You decide, therefore, to test the mower. A representative shall in the morning, an even number...
is your spatial Thinking, if you want to solve the task this week. We want to divide a cube with one straight cut. Two smaller bodies - the cut surface is flat. What geometric shapes can form...
The Alphabet you know hopefully. Then you will also know how to sort words alphabetically. Two examples: Eight faces, eight hundred and nine hundred is far ahead of Ninety. you may have noticed in these...
The gummy Problem from last week has caused some discussions. Several readers have written to me that you doubt the accuracy of the solution. Yes, my reasoning actually has weak points. I have added the solution, therefore,...
Two people and a big pile of gummy bears. What can go wrong? A lot of things. In our case, both Paul and Paula want to have as many gummy bears as possible. Thus, there is no...

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Puzzle of the week: Strange Addition

in mathematics means of abstraction. And that is why many mathematicians expect rather with letters than with real Numbers. In...