Re:

[Andre Arroyo Ruiz <arroyo@xxxxxxxxxxx>]

Recebi na lista da IMO uma questão parecida ao exame que o Nicolau
passou. Aqui vai ela:

Here's a puzzle to y'all:
> There are five houses.
>
> Each of the houses is painted in a different color and is owned by 
> people of a different nationality.
>
> Each of the owners drinks a different beverage, smokes a different 
> brand of cigarettes and owns a different kind of pets.
>
> The other clues to the puzzles are as followed:
>1. The Brit lives in a red house.
>
>2. The Swede keeps dogs as pets.
>
>3. The Dane drinks tea.
>
>4. The green house is on the left side of the white house.
>
>5. The owner of the yellow house smokes Dunhill.
>
>6. The person living in the house right in the center drinks milk.
>
>7. Norwegian lives in the first house.
>
>8. The green house ownder drinks coffee.
>
>9. The man who smokes blends has a neighbor who drinks water.
>
>10. The person who smokes Camels rears birds.
>
>11. The German smokes Marlboro.
>
>12. The man who smokes blends lives next to the one who keeps cats.
>
>13. The man who keeps horses live next to the one who smokes Dunhill.
>
>14. The owner who smokes Kool drinks beer.
>
>15. Norwegian lives next to the blue house.
>
>And the question is:
>
>                      Do you know who keeps the fish?
>
If you think your deductive reasonings are good enough, go ahead and 
give it a try. There is no trick to this puzzle, and it is recommended
that 
you use pencil and paper to help you find the answer.

You are encouraged to post whatever answer you've come up with on 
the list..

BTW, this puzzle was reported to be from Einstein himself. Yes, 
_that_ famous Einstein. If you can figure out the answer, according to
Einstein, 
you are among the top 2% most intelligent person in this world.