Einstein's Riddle!

Level 2

There are 5 houses in 5 different colors. In each house lives a person with a different nationality. The 5 owners drink a certain type of beverage, smoke a certain brand of cigar, and keep a certain pet. No owners have the same pet, smoke the same brand of cigar, or drink the same beverage. Now answer the question understated based on the following hints-

• The Brit lives in the red house.

• The Swede keeps dogs as pets.

• The Dane drinks tea.

• The green house is on the left of the white house.

• The green homeowner drinks coffee.

• The person who smokes Pall Mall rears birds.

• The owner of the yellow house smokes Dunhill.

• The man living in the center house drinks milk.

• The German lives in the first house.

• The man who smokes Blend lives next to the one who keeps cats.

• The man who keeps the horse lives next to the man who smokes Dunhill.

• The owner who smokes Bluemaster drinks beer.

• The Norwegian smokes prince.

• The German lives next to the blue house.

• The man who smokes Blend has a neighbor who drinks water.

Question:- Who owns the fish?

History Einstein wrote this riddle early during the 19th century. He said 98% of the world could not solve it. Its not hard, you just need to pay attention and be patient. Please don't search the answer on the net.

Norwegian German Brit Dane

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4 solutions

Chew-Seong Cheong
Jun 11, 2014

[Note: Many of you may think that you have seen this question before. However, if you read carefully, the nationalities were changed from the typical version that is floating around the internet. Hence, the answer is not German. - Calvin]

Who owns the fish? The answer can come from a process of elimination from the clues given. Let us first organize the facts. What are the house colors, nationalities, beverages, pets, and cigars involved?

  • House colors: red, yellow, blue, green, and white
  • Nationalities: Brit, Swede, Dane, German and Norwegian
  • Beverages: tea, coffee, water, milk, and beer
  • Pets: dog, cat, birds, horse, and fish
  • Cigars: Pall Mall, Blend, Bluemaster, and Prince

Now it is a process of linking up the data into 5 sets. Let's arrange the houses first. It is given that the German lives in the first house. and his neighbor on the right is the blue house. His house is not blue, also not red which the Brit lives in. It is not green as the green house's neighbor is white and not blue. It is not white either. Therefore, the first house, where the German lives is yellow and he smokes Dunhill. The first house is yellow and the second, blue, and its owner keeps a horse. The center house can either be red or green. It is given that the center homeowner drinks milk and the green homeowner drinks coffee. Therefore, the center house is red, where the Brit, who drinks milk, lives. The houses from left are yellow, blue, red, green and white.

It is known now that Dane drinks tea, Brit drinks milk, green homeowner drinks coffee, and Bluemaster smoker drinks beer, the German in yellow house and smokes Dunhill must be drinking water. His blue house neighbor must be smoking Blend. The blue homeowner who smokes Blend and keeps horse cannot be the Swede who keeps dog and Norwegian who smoke Prince, he must be the Dane who drinks tea. The German smokes Dunhill and the Norwegian smokes Prince; as the Pall Mall smoker keeps birds, he cannot be the Swede who keeps a dog. He must be the Brit. As one of Blend smoker Dane's neighbors the German or Brit keeps cats. As the Brit keeps birds, the German keeps cats. What is left is the Norwegian keeps fish.

The overall solution is as follows:

  • Yellow, German, Water, Cat, Dunhill
  • Blue, Dane, Tea, Horse, Blend
  • Red, Brit, Milk, Birds, Pall Mall
  • Green, Norwegian, Coffee, Fish, Prince
  • White, Swede, Beer, Dog, Bluemaster

From my working, the second house is the blue house where the Dane lives and he smokes Blend. And one of the Blend smoker's neighbors, either the Brit or the German keeps cats. It is found that the Brit keeps birds, therefore the German keeps cats. The Dane keeps horse and the Swede keeps dog, therefore the Norwegian keeps fish.

Chew-Seong Cheong - 7 years ago

I guessed so. How can a German drinks water instead of beer?

Chew-Seong Cheong - 7 years ago

wait, is it real that Einstein wrote this one ?

Nelvson Shine - 6 years, 11 months ago

well i got the answer as GERMAN who owns the fish . when it said that the answer was wrong i checked the web. even on the web the answer is German who owns the fish

avn bha - 7 years ago

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In the original question, the answer is German. But I've changed the question a bit. The correct answer is Norwegian, which can be proved by Chew-Seong's marvelous solution.

Satvik Golechha - 7 years ago

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I got the answer as GERMAN in the other question.....

ma.lourdes rogales - 6 years, 7 months ago

Tricky. I already had done this and remembered the answer was German. Next time remember to warn that this isn't the original riddle.

Rose Huntress-Ristich - 6 years, 11 months ago

Check the question searched on the Ernst .there must be any differences.

Prasanna Sarkar - 6 years, 11 months ago

The nationalities are changed here...avn bha

Het Patel - 6 years, 4 months ago

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Lol...the NORWEGIAN smokes prince haha...didn't pay attention to that...

Noel Lo - 5 years ago

Actually the hint is "Green house is on left of white house" but you have considered it to be as immediate left. Is there any solution to this problem without assuming that green house is on the immediate left of white

Krishna Kinger - 7 years ago

There is something wrong with the question, because the question says the German lives in the 1st house, it can be 1st from either right or left, the direction is not given. Secondly, if taking the condition that Green is on the Left of White, the middle house could be either Red, White or Green where I got confused, the directions aren't specified that what is been considered left and right.

Devang Srivastava - 6 years, 9 months ago

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you can say that the German lives in the 1st house from the right because he lives next to the blue house.

ma.lourdes rogales - 6 years, 7 months ago

I was wondering how to create a riddle like this one, i mean: how many initial conditions of each kind are neccessary for the problem to have an unique solution. We could think of m categories (name, color, etc..) and n different elements in each category. Can n and m be different? We could define x ij^k in {0,1} with i,j in {1,..,n} and k in {1,..,m}. A negative condition x ij^k=0, and a positive one is x_ij^k=1. With the neccesary restrictions, etc.. Does anyone knows an article about it? Thanks!

Ana Piluca - 9 months, 3 weeks ago

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I think it is like simultaneous equations. The number of variables and number of equations must be the same.

Chew-Seong Cheong - 9 months, 3 weeks ago

well actually I had did the original problem some days earlier and so i answered according to it without reading your problem.that's why i went wrong.

avn bha - 7 years ago

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i also typed german

Sriram Venkatesan - 6 years, 9 months ago
Paul Josephson
Dec 14, 2014

To me, this seems a verbal Sudoku. I think anyone good at that game could readily solve this.

I thought that too, as soon as I solved it. Funny I didn't think of Sudoku initially since I love that game. Oh well.

Chloes Galiki - 6 years ago
Medhat Abo Bakr
Nov 28, 2014

Its a process of elimination according to the given data, with some patience you will get it, some of the relations are a must like Brits live in the red house, milk in the center house and sme others in a form of relations between some spots and the others like a is next to b, so if you get with it slowly and step by step you can figure it out, hope you can...!.

In the beginning it appeared a difficult problem to me but when I started out grouping things out it worked!, it's not an ordinary riddle where the answer lies in the question itself but a different one. The solution procedure is very simple:- just group the given data into five sets according to the constrains provided in the statements.

i used a MS Excel sheet to group the data and the did some combinations . is this considered cheating ?

gaurav minhas - 6 years, 10 months ago

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