Logic Riddles

Question: A police officer was walking outside of a diner. He heard somebody yell inside the diner "No, John not the gun," followed by a gun shot. The officer immediately ran inside and found a milkman, a doctor, a lawyer, and the dead body. The cop immediately arrested the milkman.

How did the officer know the milkman man did it?

Question: There are several books on a bookshelf. If one book is the 4th from the left and 6th from the right, how many books are on the shelf?

Question: You have found a mutant algae that doubles in size every hour. It takes 18 hours for one algae plant to take up half of a certain lake.

How long would it take for two of these plants to take up half of the same lake?

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

How many feet are on his farm?

Question: There are five hen and rooster pairs. Each pair has one baby every month.

How many chickens will there be in one year?