Try to solve these 10 problems, and find out how well developed your logic

American scientist Raymond M. Smullyan (Raymond M. Smullyan) was known not only for its mathematical works, but also a lot of books about the mysteries of the trick and paradoxes.

The website chose for you a few fun tasks that not everyone in the teeth. At the end of the article you can see a gradual solution to every problem.

Portrait







Strange sentence







Kinship







Lift







Coins







Catholic







Snail







Now puzzles a bit more difficult.

How much poultry?







Profit







The skin of a bear







As these problems are solved how Much birds?

Since the price of 1 big bird equal to the price of 2 small, 5 large birds will cost the same as 10 small. So, 5 big birds plus 3 small will cost as much as 13 small. On the other hand, the price of 3 large and 5 small birds equals the price of 11 smaller birds. Thus, the difference between the price of 5 large and 3 small birds is equal to the price difference between the 13 and 11 small birds, that is equal to the price of 2 small birds. Because 2 little birds cost 20 rubles, the price of 1 little bird is 10 rubles — 20 rubles.



Profit

Imagine that the trader started the work day with $ 100. First, he bought the stock for $ 7, got $ 93. Then he sold the share for $ 8, after which his account increased to $ 101. He then bought the same share for $ 9, on account was $ 92. Finally, he sold the share for $ 10. In the end, his account has grown to $ 102.



The skin of a bear

Skin must be white, since it belongs to the polar bear living in the Arctic near the North pole. In what direction or step from the North pole to move will always be to the South. So if the bear is at the North pole, and the hunter is 100 m to the South, passing 100 metres to the East and turning North, the hunter will fly to the North pole. There are other solutions. For example, a hunter may be in parallel with a length of 100 m, and bear 100 m to the North. After 100 m to the East, the hunter will describe a full circle around the pole and return to the starting point. This is the second solution of the problem. But the hunter may be closer to the pole in parallel with a length of 50 m After 100 m, he twice describe a full circle around the pole, and will be the starting point. But that's not all. Hunter can be on the parallel of length is 1/3 of 100 m. Three times beating on the Parallels around the pole, he will also be at the origin.

Photos on the preview depositphotos
According to the materials of Raymond Merrill Smullyan


See also
Riddle that anyone will expand the boundaries of consciousness
The famous logical puzzle of the green-eyed
2 puzzles with interviews of Google, over which even geniuses have to work hard


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