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The fake ticket problem
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The fake ticket problem

A lady enters a shoe store and buys some shoes that cost 30 euros. The woman pays the clerk with a 50-euro bill but the seller, who has just opened the store, has no change to give her so she leaves the shop next door where they change her 50-dollar bill for 5-dollar bills. .

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Velázquez

In 1999 the fourth centenary of the birth of Velázquez was celebrated. The year he died is a multiple number of 5, whose tens figure is not a prime number. If all the figures in that number add up to 13, how many years did the great painter live? Solution He lived 61 years. The year he died has to start at 16 and end at 0 or 5.
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The problem of ages

Alberto is thirty-five years old, Beatriz twelve and Cecilia fifteen. When will the sum of the ages of Betriz and Cecilia be equal to Alberto's age? Solution In 8 years Alberto will be 43, Beatriz will be 20, and Cecilia 23. (20 + 23 = 43)
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The important thing is to participate

The hare and the turtle depart from the goal to walk a track in a circular stadium. While the hare goes around and a quarter the turtle only travels a third of a turn. How many laps should each one take to match the goal again? Solution When the turtle reaches the finish line for the first time, the hare is in the third quarter of the stadium, after three laps.
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Shipwreck

After four days of crossing a cargo ship sank and only part of the crew could be saved in the lifeboat. There they found provisions and water for thirteen days, one liter per person and day. On the third day after the wreck they lost part of the water from a sea stroke and at the end of the fifth day one of the men died.
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Up and down stairs

When I had already gone down 7 of the steps of the staircase that overlooks the street I ran into the neighbor's son who climbed the steps two at a time so that when I still had 4 steps left to get down the boy had already climbed All the stairs. What agility! I thought. For every step that I go under it goes up two.
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Picture collectors

Agustín, Benito, Carlos, Diego, Esteban and Federico are six collectors of paintings of which two of them are brothers. One day they went to an exhibition together and bought as follows: Agustin bought 1 painting, Benito bought 2, Carlos 3, Diego 4, Esteban 5 and Federico 6 paintings. The two brothers paid the same amount of money for each of the paintings they bought.
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From 1 to 9 and add 100

Using the numbers from 1 to 9, without changing their order or putting them together and using the basic arithmetic operations: addition, subtraction, multiplication and division, are you able to get 100 as a result? For example in this attempt: 1 - 2 + 3 + 4 + (5 × 6) + (7 × 8) + 9, we get as a result 101 Solution There are many solutions.
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How is the cat?

Monica's cat is lighter than Sandra's, but more lazy and fat than Josemi's, which is even more lazy than Victoria's, which is thinner than Monica's, which is fatter than Sandra's, which is darker than Victoria's, although Josemi's is less lazy and lighter than Sandra's.
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The hidden animal

Among this harmless pile of puzzle pieces hides one of the fiercest animals on earth. Can you find it Solution If you move away from the image you will see more easily the head of a tiger.
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Ames's room

Ames's room was invented by the American ophthalmologist Adelbert Ames, Jr. It is constructed in such a way that when viewed from the front it appears to be a common room of a cubic shape, with a back wall and two lateral sides parallel to each other and perpendicular to the horizontal plane of the floor and ceiling.
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Where is the ball going?

Watch this video that shows four roads that converge in the center. Apparently a ball placed on one of the roads should fall out of the circuit, but sometimes things are not what they seem.
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Eating cakes

When Pepito and his wife sat down to have tea with their sister-in-law and daughter-in-law, each one ate a different number of cakes (no one was left without eating) and in total they devoured eleven. Pepito's wife ate two and sister-in-law four. How many cakes did Pepito eat? Pepito solution ate five cakes. The only way to add the accounts is that Pepito's sister-in-law and daughter-in-law are the same person.
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Climb in the elevator

Four rugby players enter an elevator that can carry a maximum of 380 kilos. Paul weighs the most, if each of the others weighs as much as he does, the alarm would stop the elevator. Carlos is the lightest, the elevator could go up to five like him. Ramón weighs 14 kilos less than Pablo and only six less than Jesus weighing 17 kilos more than Carlos.
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The price of the bartofón

I have an invoice that tells me that eight astrodeniums, a bartofón, three cartunes and three dosefríos were bought for my company a month and a half ago and we were charged a total of 350 euros. Just one month ago, we have another invoice from the same supplier worth 250 euros for buying five astrodennes, two bartofones, two cartunes and a dosefrio.
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The plague of mice

In a certain city, in the face of a brutal plague of mice, cats that each hunted the same number of rodents were used. It is known that 1,111,111 were the hunted mice and less than 1,111 the cats involved. Although there was no physical evidence on the exact number of mice that each cat hunted, this data is recorded in the official records.
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Sleeping man

In this drawing we can see a man who fell asleep with a cup in his hand, and who is leaning on a round table full of books, glasses, writing devices, grapes and some drawing devices ... However, as with All visual anamorphic optical illusions, the hidden motif is not visible to the naked eye the original drawing.
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Delivering wine

Three friends bought a box full of wine bottles from a street vendor. At the time of making the distribution they saw that the box contained 21 equal bottles of which only 7 were fully filled. There were 7 others that were exactly in the middle and another 7 empty. Despite the scam, they decided to distribute the wine and bottles among all so that each one took the same amount of wine and bottles.
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The three neighbors

Ana, Carmen and Teresa are three friends who live in neighboring homes. Carmen is the one who lives in the middle house. One of them likes the theater a lot, the other goes by bicycle and the last swim, but we don't know to whom each of the hobbies corresponds. However, a neighbor of the town tells us the following: The one who likes to go by bicycle from time to time takes Teresa's dog for a walk.
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Maria's age

The square of the age of Mary is the fourth part of the square of the age of John that is half of 20. What is the age of Mary? Solution Maria is 5 years old. The square of the age of Mary: it is the fourth part of the square of the age of John that is half of 20
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The square of rectangles

We have five rectangles whose sides have the following lengths: 1, 2, 3, 4, 5, 6, 7, 8, 9 and 10 although not necessarily in this order. With these five rectangles, we can form a larger square. What is the length of said square? Solution The image shows the square formed by the different rectangles.
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