How many zombies can one person kill

Depends on weather or not you have proper training for combat and also hand to hand combat. Survival training helps as well. Proper hardware such as explosives and weaponry. The right shelter i.e. a castle of some sort. The average American could probably kill none because of fast food excess. Southerners and NRA members could probably slay (given proper gear and training) easily a couple hundred. If they have a good crack team of military experts, a few thousand most likely more given the correct equipment.