첨가 상황과 유사하게 차를 구하기보다는 남아있는 구슬의 개수만 그대로 세어 답하는 행위일 가능성이 존재하였다.
There was a possibility that it was an act of answering only by counting the number of remaining marbles, rather than finding a difference by the similar way to the addition situation.