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Veracious and liars
In detail

Veracious and liars

The truthful (or sincere) and liars are a very common fauna in the world of riddles. They are also known as "see you and mentos", "knights and rascals", knights and squires "and in many other ways. Its main characteristic is that, for some kind of psychological impulse the truthful ones ALWAYS tell the truth and the liars ALWAYS lie.

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The riddle of the necklace

I will take this opportunity to point out that the fact that my riddles are well known does not imply that everyone knows the answers. The correct answers of some of the most popular have never been published and as far as I know they have not been discovered. I will demonstrate this point by presenting the "Riddle of the necklace" that I published several years ago and that makes every person who reads it believe that they can easily solve it.
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Norway's flag

The flag of Norway is one of the five independent state flags that incorporate the Scandinavian Cross. It was adopted in the early nineteenth century and its colors represent Denmark (red) and Sweden (blue), countries of which before and after 1821 Norway was part or was united and the white cross represents Christianity.
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All black

A black car circulates on the road with the lights off, enters an alley without street lamps where no house has the lights on. Suddenly, a black cat crosses him. But the driver is able to dodge it. How is it possible? Solution Because it is day.
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The heaviest thing in the house

My fiancee and I are going to get married so we bought a little house to move in. It is a very nice house with two floors of 100 square meters each and 5 meters in total height. We are decorating it and for the moment we have bought some appliances and furniture that we keep inside the house: the fridge, a washing machine, the television, a table, four chairs, the sofa and the double bed.
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The monkey and the peanuts

A monkey has a sack full of peanuts. Every morning his master puts exactly one hundred peanuts in his bag. During the day, the monkey eats half of the peanuts it finds in the sack and leaves the other half. Since he does not like to eat half-peanuts, when the number of peanuts in the bag is odd, leave one more in the bag.
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Squares with matches

Pepe Cuadrado likes to make figures with matches. In this figure, Pepe counts five squares but he knows that by moving only two matches he can obtain another figure that has seven squares. Can you help him? You can find this and other puzzles on the site solumate.blogspot.com.es Solution Here is the solution:
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Veracious and liars

The truthful (or sincere) and liars are a very common fauna in the world of riddles. They are also known as "see you and mentos", "knights and rascals", knights and squires "and in many other ways. Its main characteristic is that, for some kind of psychological impulse the truthful ones ALWAYS tell the truth and the liars ALWAYS lie.
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My family and I

My brothers and I live with my parents in a very nice house. My father is 48 years old, the average of all our ages is 20 and the average of the ages my mother and all siblings are 16 years old. How many brothers do I have? Solution Since the average of the whole family 20 years, if we call S the sum of all ages and n the number of children we have to: S = 20 * (n + 2) and being 16 the average age when the father ( which is 48 years old) is not counted, we have to: S - 48 = 16 * (n + 1).
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Russian mathematicians

Two Russian mathematicians who are on a plane start a conversation. I think I remember you have three children ... How old are they? Ivan asks Yes, I have three children. The product of their ages is 36 and the sum of the three is exactly the same number as today. mmm ... sorry Igor, but I don't have enough information, Ivan replies after thinking briefly.
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How to cross a river

A detachment of 100 soldiers must pass a very deep river, but the bridge is destroyed. Suddenly the commander sees two children sailing in a small boat near the shore but the boat is so small that it only fits one soldier or two children and no one else. How many boat trips were necessary so that all the soldiers could cross the river with the boat and how did they do it?
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Our brain deceives us

The representation of a 3D universe on a 2D screen creates all kinds of paradoxes or else, watch this video and discover that things are not what they seem. The solution in the video.
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The riddle of sales

Explaining his experiences with the sales, Smith says that half of his money disappeared in just 30 minutes and that after the purchases he had as many pennies as dollars he had before and half the dollars of the pennies he had before. How much money did you spend? Solution Smith must have gone on sale with $ 99.98 and spent everything except $ 49.99.
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Mr. Euritis

Mr. Euritis wants to distribute 2008 euros between Alberto, Benito and Carlos as follows: give € 1 to Alberto, € 2 to Benito, € 3 to Carlos, then € 4 to Alberto, € 5 to Benito, € 6 to Carlos , and so on, until you run out of money or cannot deliver the amount you touch. How much money does Benito receive and how much money will Mr. Euritis have left?
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The soldiers

Arturo has plastic dolls shaped like Indians, soldiers, cowboys and horses in identical quantities for each of the four categories. On the day of his birthday he invited some friends to play and at the end of the day he found that he was missing a third of his dolls. He also found that: He has as many horses as cowboys left.
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How do we cross the river?

To cross this river 6 meters wide, these two hikers only have two boards of 5 meters each. How can they pass without getting wet? Solution A board with 3 meters of its length is placed on land and the other two on the river (like a trampoline on the water). One of the hikers is located at the end of the plank that is on the mainland as a counterweight.
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Cars in the hole

In this image you can see some cars that seem to fly ... but look closely, it also gives the feeling that the hole is swallowing them. Solution It is an optical illusion that simulates movement.
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Playing with the calculator

Replace the questions in the following expression with the basic mathematical signs (+, -, *, /) so that each one appears only once. The goal is to find the largest possible number and the lowest number we can get: 3? 7? 5 ? 4 ? 3 = X Solution The maximum value we can obtain is: 3/7 + 5 * 4 - 3 = 18.71 And the minimum value is: 3/7 - 5 * 4 + 3 = -15.29
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The price of milk

A farmer sells whole milk from his cows at 80 cents a liter. Skim milk, on the other hand, sells it at 50 cents a liter. A customer asks for 50 liters of semi-skimmed milk that is obtained with the mixture of the other two and is sold at 60 cents. How many liters of whole milk did he need to serve his client?
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Running

Héctor and Raúl run while they talk side by side. After a while Héctor has traveled 17 kilometers and Raul 20. They have always been side by side and have no mobile phone or any communication device. How could it happen? Solution Both are doing gymnastics and run on some tapes that go at different speeds.
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The zebra, the elephant and the rabbit

The zebra, the elephant and the rabbit only eat carrots. The rabbit eats in a year not leap the same amount of carrots that the elephant eats in two days and what the elephant eats in one day matches what the zebra eats in 5 days. If in one day the elephant, the zebra and the rabbit eat 55 Kg of carrots, how many kilos of carrots do each eat per day?
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