Logic Riddles

Farmer riddle (medium)

Question: A farmer has 10 cows, all but six die. How many are left?

Question: "The Captain is my brother," testified the soldier. But the Captain testified he didn't have a brother. Who is telling the truth?

Question: When is 99 more than 100?

Cops (medium)

Question: one day there were two cops, they got a call saying there was some kind of mystery so they went to the house were the mystery was at, the lady there said she could not figure out how many letters the special word was, later the cops went home knowing that they had done a good job. How many letters was the special word?

Question: There is a 5 gallon and a 3 gallon box. You also have a hose with unlimited water. How are you gonna make the 5 gallon have 4 gallons using your items? (You do not know the exact measure measurements of a gallon)