Einstein's Problem
Give yourself a brain boost: There are five houses in five different colors in a row. In each house lives a person with a different nationality. The five owners drink a certain type of beverage, smoke a certain brand of cigar and keep a certain pet (one of which is the fish). No owners have the same pet, smoke the same brand of cigar, or drink the same beverage. Other facts:
- The Brit lives in the red house.
- The Swede keeps dogs as pets.
- The Dane drinks tea.
- The green house is on the immediate left of the white house.
- The green house's owner drinks coffee.
- The owner who smokes Pall Mall rears birds.
- The owner of the yellow house smokes Dunhill.
- The owner living in the center house drinks milk.
- The Norwegian lives in the first house.
- The owner who smokes Blends lives next to the one who keeps cats.
- The owner who keeps the horse lives next to the one who smokes Dunhill.
- The owner who smokes Bluemasters drinks beer.
- The German smokes Prince.
- The Norwegian lives next to the blue house.
- The owner who smokes Blends lives next to the one who drinks water.
The question is: What is the nationality of the person who owns the fish? Hint: Use a grid
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1 solution
This riddle is a bit like sudoku Start with the clues that you can immediately fill in on the grid. You know whoever lives in the center house drinks milk (clue number eight) and you know that the Norwegian lives in the first house (clue number nine).
Once you have those two squares filled in, you can use logic to fill in the rest. For example, clue 14 says the Norwegian lives next to the blue house. Since we already know the Norwegian lives in the first house, there's only one house next to him. So house number two must be blue
You can fill in much of the grid this way. Once you figure out who owns the horse though, things get tricky. At this point, it's helpful to label the rest of the empty boxes with all the remaining possibilities and narrow it down from there.
Once you do that, you can see that water is the only possibility for house one. Then you can unravel the rest of the clues using the same deduction method as before.
The answer:
Eventually, you'll fill in all the squares and figure out that (drum roll...) the German in house number four owns the fish.
All credits to https://www.businessinsider.com/how-to-solve-einsteins-riddle-video-2015-9?IR=T