Posted in History & Literature


The following logic problem was set by Einstein, who said that 98% of the world would not be able to solve it.

  • There are five houses of five different colours.
  • In each house lives a person with a special nationality.
  • The five owners drink a certain type of beverage, smoke a certain
  • brand of cigars, and keep a certain pet.
  • No owner has the same pet, smokes the same cigar, or drinks the same beverage.

The question is: Who owns the fish?


  1. The Brit lives in the red house.
  2. The Mexican keeps dogs as pets.
  3. The Chinese drinks tea.
  4. The green house is on the left of the white house.
  5. The green house’s owner drinks coffee.
  6. The person who smokes Pall Mall rears birds.
  7. The owner of the yellow house smokes Dunhills.
  8. The man in the centre house drinks milk.
  9. The American lives in the first house.
  10. The man who smokes Blends lives next to the one who keeps cats.
  11. The man who keeps a horse lives next to the man who smokes Dunhills.
  12. The owner who smokes Bluemasters drinks beer.
  13. The German smokes Prince.
  14. The American lives next to the blue house.
  15. The man who smokes Blends has a neighbour who drinks water.

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