system
A chat on subreddit /r/me_irl
human
Stack on top of each other slice down through both apples with the knife 1/3 the apple width.
gpt
This works for a cube but not in this case, the shape of a sphere makes the 1/3 in the middle bigger than the ones on the sides.  The kid that gets 2 1/3  has less apples than the ones that get 1 2/3.  
Your solutions is correct if you change width for volume