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The sister couples club

A club consists of 10 girls, whose ages are all different and range from 4 to 13 years. In addition, it has the peculiarity that girls are two to two sisters. The sums of the ages of the sister couples are 10, 13, 17, 22 and 23 years respectively. Clara, who is 7 years old, is one of the club members.
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Articles

Stamps for one dollar

A lady handed a dollar bill to a post clerk and said, "Give me some two cent stamps, ten times that amount of one cent stamps and the rest in five stamps." How can the employee do to meet this unique demand? Solution You must deliver 5 stamps of 2 cents, 50 of 1 cent and 8 of 5 cents that together add exactly 1 dollar.
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Articles

Moving frames

The optical illusion that we show you below shows a completely static image and yet it seems that the pictures move. It is an illusory movement in which our brain perceives a non-existent movement.
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Playing chess

Three friends played chess a total of three games. If everyone played the same number of games, how many games did each play? Solution Three chess players participate in three games. If the three friends each played the same number of times then each played two games.
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Night guard

A night watchman at a factory warns his owner not to get in an elevator, since last night he dreamed that he fell causing serious damage. A few days later the elevator suffers a spectacular accident, just as the night watchman had prophesied. The owner, grateful, gives a generous tip, but at the same time dismisses the guard.
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Articles

The three Kings

Jerónimo, Luis and José Bonaparte were the three brothers of Napoleon. One was appointed king of Spain, the other king of Holland and the third king of Westphalia. But Jerome was not king of Holland; The king of Holland was not called Joseph and Joseph was not king of Westphalia. What country was King Luis from? Solution He was king of Holland.
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Articles

A peculiar writing

The text of this puzzle game is different. If you read it carefully, it is not difficult to perceive that it has a direct style, which is of a different nature and condition. It is, as you can see, a rare document. Indeed, surely you (with your enormous lucidity and precision) discover what makes it very specific.
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Articles

Bird family

In this beautiful painting by Octavio Ocampo we can see a family of birds in which the mother is bringing food to the nest for her chicks. Are you able to find the woman's face that is hidden in the image? Solution If you move away from the image you can see how the face of a woman appears in which the bora represents the bird that takes food to the nest, the tree is the silhouette of the face and the bird above becomes the eye.
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Articles

Let's synchronize our watches

A man who had no wristwatch or pocket watch had a very accurate wall clock that only stopped when he forgot to wind it up. When this happened, he went to his friend's house, spent the afternoon with him and when he returned he set the clock. How is it possible? Solution When you leave your home, with the clock stopped, wind the clock and write the time on paper.
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Articles

The transport company

Due to the good progress of our transport company we have decided to buy eight more trucks for our fleet. The problem is that the trucks we currently have already occupy the entire available space of our garage so we will expand it by 25% to accommodate exactly our entire fleet.
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Articles

Geomagic square

The image shows an incomplete geomagic square. In a similar way to the magic squares in which when adding all the numbers of a row, column or diagonal we always get the same result, in this geomagic square if we put all the pieces of a row, column or diagonal together we always get a figure of it size and shape
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The geomagic square V

The image shows a geomagic square. In a similar way to the magic squares in which when adding all the numbers of a row, column or diagonal we always get the same result, in this geomagic square if we put all the pieces of a row, column or diagonal together we always get the same geometric figure .
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Articles

Ice in the water

We have a full glass of water to the edge where an ice cube floats. What will happen when the ice melts? Will the water level drop? Will some of the water overflow? Will the level not change? Solution The answer is that the water level is maintained. To understand this, we have to use physics.
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Articles

What salary do you prefer?

When you go to work in a company, your new boss makes this curious proposal: I offer two possible salaries: You can collect a base salary of € 40,000 per year and you will have an increase of € 8,000 every year. I offer you a base salary of € 20,000 every six months and an increase of € 2,000 for every six months worked.
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Articles

The young carpenter's puzzle

The illustration itself tells the story and it is not necessary for Sherlock Holmes to tell us that the boys have found an old toolbox in the shed that their mother is not at home since she has attended a meeting and that it should be Thursday that It is the day the maid pounds. There are other interesting aspects, such as how Towser is going out through the door once the boys have nailed the side of the house.
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Articles

The basketball game

At the end of a basketball game, the coach of one of the teams realizes that all his players, including all three reserves, have played exactly the same time. How many minutes has each player played on the team, if the match lasted 40 minutes? Solution Since there are always 5 players on the field, 40 × 5 = 200 player minutes have been used in the 40 minutes of the match.
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Articles

Mother's age

The riddles of ages are always interesting and exert a certain fascination on young people with mathematical inclinations. They are usually extremely simple but in this problem the data is so scarce and the proposition so different from what is expected that the question is truly alarming.
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The big collision

Two spaceships follow a frontal collision path. One of them travels at 8 kilometers per minute and the other at 12 km / minute. Assuming that at this moment they are exactly 5,743 km away. away from each other, how long will they take a minute before crashing? Solution Since the distance to which they are one minute before crashing is requested, the data of 5.
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The planet Lulumba

Lulumba is a planet with an immense sea and a single continent composed of seven nations that are: Alcundia, Bolimia, Concolia, Desdelua, Estolia, Firnea and Galania. Two of these nations have no sea. Firnea is not a neighbor of Galania or of Concolia. Concolia is not a neighbor of Desdelua or of Alcondia. Alcundia is not a neighbor of Engolia, and Galania Bolimia has at least two beaches.
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Articles

Discount in the video game store

Andrés is very happy since his father has promised him a video game for his birthday. The parent carries a 6% discount voucher that can be combined with other offers and another 12% discount voucher that is not cumulative. Upon arrival at the store they discover that, exceptionally, they have lowered the prices of all video games by 6% so you have the option of using the additional discount of 6% or using the discount of 12% in which case the generalized discount of 6% that the store applies.
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