Logic Riddles

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

Question: One female dog goes in and there are no other dogs in there so why did dogs come out?

Question: Dracula was out getting a drink but his watch was broken so he died.

Why?

Question: what are the next two letters in this sequence: A, E, F, H, I, K, L, M,

Question: In the harbor of a small town, there is a large boat. Coming off of the boat is a ladder reaching down so that the bottom rung is just above the surface of the water. As the tide comes in, the water rises at 1 foot every 30 minutes, and continues like this for 3 hours. If the rungs are each 1 foot apart, how many rungs are under water when the tide stops rising?