Here's a tough one for you. I spent approximately half an hour yesterday going at this the wrong way until I realized my mistake, and then solved it in 5 minutes this morning.
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.
The question is: Who owns the fish?
The Dane lives in the Blue house.
The Norwegian keeps Cats as pets.
The Britt drinks Milk.
The Red house is on the left of the Yellow house.
The Red homeowner drinks Beer.
The person who smokes Dunhill rears Horses.
The owner of the White house smokes Bluemaster.
The man living in the center house drinks Tea.
The German lives in the first house.
The man who smokes Prince lives next to the one who keep Dogs.
The man who keeps the Birds lives next to the man who smokes Bluemaster.
The owner who smokes Pall Mall drinks water.
The Swede smokes Blend.
The German lives next to the green house.
The man who smokes Prince has a neighbour who drinks coffee.
It is
MANDATORY to explain your answer. What lead you to the conclusion and so forth
You may NOT cheat. No browsing the internet to find the answer etc.