Neon Text Widget

Wednesday, 9 September 2009

Einstein's Riddle

Einstein's Riddle
There are 5 houses of 5 different colours. In each house lives a person of a different nationality. Each of the 5 residents drinks a certain type of beverage, smokes a certain brand of cigar, and keeps a certain pet. None of them have the same pet, smoke the same brand of cigar or drink the same beverage.

The question is: Who owns the fish?

Clues:

► 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 resident of the green house drinks coffee.
► The person who smokes Pall Mall rears birds.
► The resident of the yellow house smokes Dunhill.
► The resident of the centre house drinks milk.
► The Norwegian lives in the first house.
► The person who smokes Blends lives next to the one who keeps cats.
► The person who keeps the horse lives next to the one who smokes Dunhill.
► The person who smokes Bluemasters drinks beer.
► The German smokes Prince.
► The Norwegian lives next to the blue house.
► The person who smokes Blends has a neighbour who drinks water.
Einstein's Riddle: Hint

Statements 8 and 9 give us definite information, the first house belongs to a Norwegian and the third house's owner drinks milk. Statement 9 together with statement 14 allow us to deduce that the second house is blue. The possibilities for all the remaining assignments are summarized in the following table. Printing this table and crossing off possibilities that can be eliminated using the statements is a good way to proceed.

Number
1
2
3
4
5

House Color
Red
Green
White
Yellow
Blue
Red
Green
White
Yellow
Red
Green
White
Yellow
Red
Green
White
Yellow

Nationality
Norway
Britain
Sweden
Denmark
Germany
Britain

Sweden

Denmark

Germany
Britain

Sweden

Denmark

Germany
Britain

Sweden

Denmark

Germany

Beverage
Tea
Coffee
Beer
Water
Tea
Coffee
Beer
Water
Milk
Tea
Coffee
Beer
Water
Tea
Coffee
Beer
Water

Cigar
Pall Mall
Dunhill
Bluemasters
Prince
Blends
Pall Mall
Dunhill
Bluemasters
Prince
Blends
Pall Mall
Dunhill
Bluemasters
Prince
Blends
Pall Mall
Dunhill
Bluemasters
Prince
Blends
Pall Mall
Dunhill
Bluemasters
Prince
Blends

Pet
Dogs
Birds
Cats
Horses
Fish
Dogs
Birds
Cats
Horses
Fish
Dogs
Birds
Cats
Horses
Fish
Dogs
Birds
Cats
Horses
Fish
Dogs
Birds
Cats
Horses
Fish

Answer the German owns the fish