Answer :
My theory is the cookie could be smaller because Ellen's cookie might have been smaller as a full than Joseph's.
For example, Joseph's cookie may have 24 pieces, while Ellen's cookie may have been 4 pieces.
For example, Joseph's cookie may have 24 pieces, while Ellen's cookie may have been 4 pieces.
The Cookie that joseph was eating was larger. Half of a small cookie is smaller than a quarter of a larger cookie.