Logic Riddles

Question: If a white house is white and a yellow house is yellow, what color is a green house?

Question: A claustrophobic person gets on a train. The train enters a tunnel just as it is leaving the station.

Where is the best place for him to sit?

Question: If a farmer has 5 chickens, two horses, and a wife.

How many feet are on his farm?

Question: A man in prison has a visitor. Afterward a guard asks the inmate who the visitor was to him. The inmate replies: "brothers and sisters I have none, but that man's father is my father's son." Who was the visitor to the inmate?

Question: A man is twenty years old but has only had five birthdays. How is that possible?