Think about it: a puzzle about barrel + task logic

Sometimes to do some action only with special tools. And if they don't have one, we have to use all their ingenuity!





The website invites the reader to try to solve an interesting puzzle game that will test your logical thinking.

Imagine you have a barrel, which is filled water to about half. You need to check if it is filled exactly to the middle, and you have no improvised devices to do it. How is it possible to check to what level the water is filled in a barrel?

But there is some logical paradox. In fact, the half-empty barrel — exactly the same as full. And if the two parts of the barrel are equal to each other, it turns out that the whole is also the same. And so as half-empty capacity is equal to half full, then empty the barrel will be full. But as it turns out this conclusion?

Answers



In order to check the water level, it is necessary to tilt the barrel so that the water touched her outer edges. If the bottom of the tank is shown from under the water, hence the fluid level a few less than half. When the slope of the bottom of the barrel is not visible, the water in it just filled more than half. Well, in that case, when the edge of the bottom of the barrel is exactly on the water level, the water in the barrel is exactly half.





As for a little incongruous conclusion about the equality of the full and empty barrels was a half an empty keg is a barrel, one half of which is empty and the second filled. And in the argument it turned out that the definition of "thin" has come to mean "half empty" and "full barrel" came to mean "half full". Hence, a wrong final conclusion.

Excerpt from the book by Yakov Isidorovich Perelman "101 puzzle".

via factroom.ru