User blog:V3hemenc3/What is the accepted number of farm on an AD carry?

i've been trying to get a grasp on farming with auto attacks and frankly, i think i'm too dumb to actually get a properly good amount of farm even when i'm ahead. supports doesn't need farm, junglers farm the jungle (duh), mid laners has spells, and top laners builds Gp5. i can't seem to farm on AD even with full attack damage reds. I kept thinking i'm behind in farm no matter how much i am ahead in kills. what is the magic number then?