In a small town, there are five houses in a row, each painted a different color. Each house is occupied by a person of a different nationality. Each homeowner drinks a different beverage, smokes a different brand of cigar, and keeps a different pet.

Here are some additional clues:

1. The Brit lives in the red house.
2. The Swede keeps dogs as pets.
3. The Dane drinks tea.
4. The green house is immediately to 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 Dunhill.
8. The man living in the center house drinks milk.
9. The Norwegian lives in the first house.
10. The man who smokes Blends lives next to the one who keeps cats.
11. The man who keeps horses lives next to the man who smokes Dunhill.
12. The man who smokes Blue Master drinks beer.
13. The German smokes Prince.
14. The Norwegian lives next to the blue house.
15. The man who smokes Blends has a neighbor who drinks water.

The question is: Who owns the fish?

Answer:

The German owns the fish.

Here’s how the clues fit together:

1. The Norwegian lives in the first house.
2. The house next to the Norwegian is blue.
3. The man in the center house drinks milk.
4. The green house is immediately to the left of the white house.
5. The green house’s owner drinks coffee.
6. The Brit lives in the red house.
7. The yellow house is next to the blue house and the Norwegian lives in the yellow house.
8. The German lives in the green house and drinks coffee.
9. The person who smokes Pall Mall has birds.
10. The person who smokes Dunhill lives in the yellow house.
11. The man who keeps horses lives next to the man who smokes Dunhill.
12. The Swede keeps dogs.
13. The Dane drinks tea.
14. The German smokes Prince.
15. The person who smokes Blends lives next to the person who keeps cats.
16. The person who smokes Blends has a neighbor who drinks water.
17. The person who smokes Blue Master drinks beer.

When all these clues are arranged systematically, it turns out that the German, who lives in the green house, is the one who owns the fish.