User blog comment:V3hemenc3/What is the accepted number of farm on an AD carry?/@comment-91.120.13.74-20120919075425

Too dumb? It has nothing to do with brains... you just need to practice last hitting a bit more. Laning as an AD requires you to divide your attention, and focus on everything that's happening around you (minions getting low, position of the enemy, map, etc.). Once you master that, you'll be fine.