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Ana, Beatriz and Carla enter an ice cream shop. Carla, who carries twice as much money as Beatriz, buys three ice creams of 90 cents each and now has twice as much money as Ana, but half as much as Beatriz. On leaving, they find three cents on the ground and so they can return all three on the bus.

Two clocks adjust with the time of Big Ben at twelve o'clock at night. One of them is broken and advances three minutes per hour. An hour and a quarter ago he stopped pointing at 16:48. Given that 24 hours have not yet passed, what time does the clock indicate that it works well? Solution The wrong clock stopped at 4:48 p.m., that is, it had been running for 16 hours (the 48 minutes it marks are the ones it has advanced at that time).

Three children: Alberto, Benito and Carlos wear shoes of different colors. Alberto's shoes are green, Benito's are blue and Carlos's are red. As we are in carnival, they decide to exchange their shoes with each other so that each one will have two shoes of two colors that are not their own.

Looking at the clock I see that the minute hand points to a number that coincidentally is equal to the number of minutes left to be 12 o'clock. What time is it? Solution The minute hand should point to 10 which are just the minutes remaining to arrive at the next hour, in this case 12:00.

Discover what place each person in the family occupies in the following blank family tree, based on the clues given below: "Ana is married to Pedro" María and Felipe are brothers "Felipe and Jorge are brothers-in-law" José and Francisca also they belong to the family "Juan's 1st surname is different from his grandfather's" Ana has only two children, just like Maria and Pedro "Ana's wife's wife, her name is Camila" Pablo and Felipe are father and son (not necessarily in that order) "Constance has a younger brother and an older sister Solution This is the solution:

Here is a curious fact that happened to me the other day. My wife sent me to the garden to dig a ditch to plant azaleas, but since I am not a very hardworking person, but a good businessman, I hired a sick old man who promised to dig the ditch for two euros. The old man decided to ask for help from his grandson, a healthy and strong boy who agreed to help him in exchange for distributing money according to his abilities.

This figure is a challenge to intelligence. If you look at the image you can count fifteen young people in different positions. But ... what if we exchanged boxes A and B? Click on the image to check it. The image is recomposed from its pieces, so that the young women apparently recombine again.

We have six eggs of various sizes that can be introduced into each other, as in Russian dolls. The largest weighs 150 grams, then there are two equal ones, smaller, weighing 100g each, there is another one of 75g, one of 50g and finally the smallest of 25g. They are placed on top of the scale in such a way that they balance each other.

Try to guess which cards are hidden, from the following clues: To the left of the king, there are two cards. One heart is just to the left of the other. There is a clover to the right of a heart. A two is to the right of an ace. What three cards are hidden? Solution The first clue tells us that the letter on the right is a king.

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? Solution

In the realm of riddles there is nothing more fascinating than the collection of problems concerning the Greek cross and its peculiar relations with the square, the parallelogram and other symmetrical figures. Instead of the well-known problem of converting a cross into a square by the least possible number of cuts, we propose the challenge of making two crosses from one with the least possible number of cuts.

We present to you this riddle known as the Covent Garden Problem, which appeared in London half a century ago accompanied by the surprising statement that it had baffled the best English mathematicians. The problem constantly reappears in one way or another, usually accompanied by the claim that it has baffled European mathematicians, which must be taken with due mistrust.

The map shows twenty-three major cities in Pennsylvania connected to each other by cycling routes. The problem is simple: start your summer vacation and go from Philadelphia to Erie going through each city once and without going twice the same way. It is all that needs to be done. The cities are numbered so that participants can describe the route to follow by means of a numerical sequence.

A merchant sold a bicycle for $ 50, then bought it again for $ 40, clearly earning $ 10, since he had the same bike and also $ 10. After having bought it for $ 40, he resold it for $ 45, earning $ 5 more, or $ 15 in total. “But,” says an accountant, “the man starts with a bike worth $ 50, and at the end of the second sale he only has $ 55!

In this little riddle, simple but instructive, Mrs. Wiggs is explaining to the adorable little Maria, that she now has a larger square of cabbages than last year, and therefore, this year she will have 211 more cabbages. How many of our mathematical experts and agronomists can estimate the total head of cabbage of Mrs. Wiggs, so that you can get an idea of your contribution to the Chukrut market?

Remember Alicia's remarkable experiences with the Cheshire cat, who had a habit of disappearing into the air until only her irresistible smile remained. When Alicia first saw her feline friend, she wanted to know what kind of animal she was, and as in Wonderland the questions are always asked in writing, she wrote her question.

This riddle goes from three small chestnut seekers who decided to share the spoils in proportion to their age. It is a very beautiful problem, which will surprise the very proficient in mathematics. These little girls had never dedicated a second to mathematical arithmetic. They hadn't even bothered to count the number of chestnuts they had collected, 770.

The theme of this puzzle is familiar to the residents of the Buzzard Bay neighborhood, and presents one of the many problems that are undoubtedly known to all who enjoy the pleasures of duck hunting. There are a thousand problems related to this sport, all of which are undoubtedly worthy of consideration, but it is possible that fans are more familiar with them than myself, so I will only refer to a single proposition that may be peculiarly characteristic of my style To hunt ducks

Today at school, someone has drawn on the board a cartoon of the math teacher, and against all odds, I have not done anything funny. As the culprit has not confessed, he has punished us all without leaving until we solve the following problem: In the following sequence of numbers: 12345678910111213….