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The missing numbers
Articles

The missing numbers

The archaeologist is examining a division operation, already completed and with all its steps, carved into a boulder. Due to the erosion of the rock, many of the numbers are not readable. Fortunately, the eight readable digits provide enough information to allow us to provide the missing figures.

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How are you doing?

We propose a most curious challenge. Look closely at this picture. If you look closely, you will see that some numbers are glimpsed in the central part. If you have difficulty seeing them, you can try to zoom out or approach the monitor until you can focus them correctly. Are you able to see what number it is?
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Articles

The true phrase

Which of these ten sentences is true? »Exactly one of these ten sentences is false. »Exactly two of these ten sentences are false. »Exactly three of these ten sentences are false. »Exactly four of these ten sentences are false. »Exactly five of these ten sentences are false. »Exactly six of these ten sentences are false.
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How does money influence the relationship?

Traditionally it was the man who had the economic support of the family. In the last ten years, women have displaced men in managerial and operational positions such as financial institutions, in the service sector, in the commercial sector. Especially in young marriages, women tend to have more job stability, which means they have to assume functions that they did not have before.
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A study of an English university

Vector of School created by vectorpocket Segeun an etsduio of an uivenrsdiad ignlsea, no ipmotra el odren in which the ltears etsan ersciats, the uicna csoa ipormtnate is that the pmrirea and the last ltera are ecsrites in the cocrrteal psyiocion. The rsteo can be ttaolmntee badly and still read it without pobrleams.
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Articles

Too much coffee?

Some friends are left to drink coffee, for some of them this coffee will not be the last: Jan is served three times as many tablespoons of sugar as the person who drinks 4 cups. Three people, including the one who uses 4 tablespoons, do not put milk in the coffee. He who drinks a cup a day (which is not Max) drinks his coffee without sugar.
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How does creativity work?

On how creativity works there is an anecdote from Sir Ernest Rutherford, president of the British Royal Society and Nobel Prize in Chemistry in 1908, told the following: Some time ago, I received a call from a colleague. He was about to zero a student for the answer he had given in a physics problem, even though he firmly stated that his answer was absolutely correct.
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Articles

The sick nephew

Here is a kinship problem whose response is very curious. Uncle Ruben was in the big city to visit his sister Mary Ann. They walked together along a street when they passed a small hotel. - "Before we leave," Ruben told his sister, "I would like to stop for a moment and ask for a sick nephew who lives in this hotel."
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Meet friends

Four friends have stayed to go to the movies to watch a movie. Andrés arrives at the meeting point immediately after Bienve, meanwhile Diana arrives between Celia and Andrés. Could you say in what order they have come to the appointment? Solution First: Bienve Segundo: Andrés Third: Diana Fourth: Celia
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Articles

The hidden figure

In the image that appears on the right, two figures are shown. The one that appears more to the left in the image is also hidden inside the figure that appears more to the right. Are you able to find it? The hidden figure is shown in red: Solution
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Articles

The naugrafio

After a storm, the ship you were traveling on is shipwrecked. Before leaving you have the opportunity to take something that is useful; you have to choose between a box of nails or a hammer. You cannot take everything, you must quickly decide on one thing or the other, what would you choose? But the misfortunes are not over here.
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What letter is missing?

On the wall of my house has appeared this enigmatic inscription: Could you say what is the missing letter and why? Solution They are the initials of the numbers (U) no, (D) os, (T) res, ... therefore the missing letter is the "N" of (N) nine.
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The Hindu Flower Trick

Let's see here an illustration of the famous Hindu flower trick. The fakir plants a seed in the hat and a beautiful flower suddenly appears; then he asks him to take the seven pieces and reorder them so that they form a Greek cross. Solution We can form a cross, as shown in the following illustration:
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The problem of jelly beans

In the gang of my neighborhood we are as many boys as girls and we all love jelly beans. Today my friend Andrea has found 7 cents under the bank where we met and has decided to share them with the whole gang, so we have gone to the jelly beans store in front. In the store there are three types of goodies.
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Weighing the baby

Mrs. O'Toole is a decidedly saving person. She, her baby and her dog are trying to weigh themselves, all for a penny, which is what a single weight of the scale costs. If you know that it weighs 100 pounds more than the combined weight of the dog and the baby, that the dog weighs 60% less than the baby and seeing what the scale marks, can you determine the weight of the small cherub?
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The jigsaw puzzles

Of course we all know the problem of the man who had a barrel of honey to sell and encounters a customer who owns a three-quart and a five-quart container, and who wants to buy four quarts of honey. It is simple to transfer the honey with both measures until you reach the required four quarters, but exercise the gray matter of your brains and see if you can discover how few changes that problem can be solved.
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Articles

The missing numbers

The archaeologist is examining a division operation, already completed and with all its steps, carved into a boulder. Due to the erosion of the rock, many of the numbers are not readable. Fortunately, the eight readable digits provide enough information to allow us to provide the missing figures.
Read More
Articles

Smith's age

Smith works in an insurance agency and spends so much time thinking about numbers, data and death tables, that he doesn't know how to talk about anything else. When he has to solve a statistical problem, he runs home to explain it to his wife, who always says he has no idea of ​​mathematics, to illustrate it in the art of numbers.
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The battle of Hastings

All history students know the mystery and uncertainty that reigns regarding the details of the memorable battle that took place on October 14, 1066. This riddle deals with a curious passage in the history of that battle, a passage that has not received the attention it deserves.
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The riddle of the red pica

During a recent visit to the Whist and Chess Club of Crescent City, I was struck by the curious design of a red pike that adorned one of the windows of the main meeting room. The design came from Dresden and, in the manner of the stained glass windows of the cathedrals, is made with numerous pieces of colored glass, skillfully assembled to achieve the desired figure.
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A bit of origami

Mizuki is an expert origami (if that word exists) Japanese and says he has the world record of folding a paper in half with 42 folds. Some experts doubt the veracity of their claims since there is no evidence that they have achieved such a feat. We have consulted several mathematical experts who have made some estimates “in the eye of a good cubero” and have told us the following. If we could fold a paper 42 times, it would have a thickness equal to the length of a soccer field.
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