# Geometric game

To play, you need a rectangular sheet of paper and any identical geometric shapes with a center of symmetry, e.g.. domino bones, matchboxes, identical coins.
Two people are playing. The draw decides, who is to start the game. Player drawn bets …

# Dealer's trouble

A salesman took notice, that an ordinary weighing pan, which he was using, has one arm longer, so it does not give the proper weight. Of course, he decided to send the scale back for repair; it did, however, that he had to first dare the buyer …

# Accurate clock setting

I do not have a pocket watch at the moment, is under repair at the clockmaker, and my wall clock stopped. So I go to a friend, where - as I know - clocks always work perfectly, I spend some time with him and when I come home I set …

# Chest with balls

The factory sent a cubic crate with steel balls. The empty chest weighed 2 Kg, and the gross weight of the box with the balls was 18 Kg. They were in the chest 64 the same balls arranged in four layers: at the bottom of the box lay a layer of four rows …

# Where to wait for the post office next to the road

Some distance from the highway, running in a straight line here, there are two villages. There is a post office on the road. The village leaders made an appointment, that one day one, on the second day they will send a messenger; and the messenger will answer the mail and forward to the neighbor …

# Conversation about the age of son and father

Before, more or less 20 Years ago, we found such a conversation between a son and a father in the Parameter magazine. — Son: "Daddy, today is the first day of the new year, and at the same time my birthday and yours. Do you know, Daddy: the sum of the digits of the new year is equal to this, How much …

# How much water is in the barrel

Two gardeners argued over the amount of water in the barrel; it was about dissolving potassium salt in it. One of them argued, that there is more than half of the water in the barrel, the other insisted, that there is less. How to find out, who has …

# A resourceful farmer

On the farm, which was not very rich in weights, the farmer wanted to weigh puck bags of grain. The decimal weight was what it was, but some weights were missing, so that it was impossible to weigh a weight greater than a half a quintale, and less than a quintal. The bags had …

# Identifying the directions of the world with a pocket watch

By means of a pocket watch it is possible to determine on a sunny day with sufficient accuracy for practical purposes the four directions of the world on the horizon, tj. north direction, noon, east and west. The method is so simple and easy to understand, that you should be surprised,

# A phenomenal computer-cavalryman

A brilliant cavalryman was once famous in France, which, regardless of the number of participants in the merry parade, was able to respond immediately, how many different ways the riders could have grouped into equal ranks, driving in pairs, pc three, after four, whereby in …