Puzzle on 3/15/03
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Four animals have the names Tiger, Trigger, Spotty, and Fluffy.

One animal is a cat. One is a dog. One is a sheep. One is a horse.

Spotty is smaller than both the dog and Fluffy.

The horse is younger than Tiger.

Trigger is the oldest and is a good friend of the dog.

What is each animal's name?

 

The solution

 

Let's make a table and record what we know from the clues.

 
Tiger
Trigger
Spotty
Fluffy
cat        
dog        
sheep        
horse        

 
Clue 1
Spotty and Fluffy are not the dog.
Spotty is not the sheep or horse.
Tiger
Trigger
Spotty
Fluffy
cat
no
no
yes
no
dog    
no
no
sheep    
no
  
horse    
no
  
 
Clue 2
Tiger is not the horse.
Tiger
Trigger
Spotty
Fluffy
cat
no
no
yes
no
dog    
no
no
sheep    
no
  
horse
no
  
no
  
 
Clue 3
Trigger is not the dog or the horse.
And now we can fill in the rest of the table.
Tiger
Trigger
Spotty
Fluffy
cat
no
no
yes
no
dog
no
yes
no
no
sheep
yes
no
no
no
horse
no
no
no
yes

Spotty is the cat.
Tiger is the dog.
Trigger is the sheep.
Fluffy is the horse.
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