Question 21
Mel sells pretzel nuggets only in packs of $5$, $6$, or $11$. What is the greatest total number of nuggets that cannot be purchased using whole packs?
Source correction: the printed example says $8$ can be purchased, but that is impossible with these pack sizes; both $8$ and $9$ are impossible.
Source correction: the printed example says $8$ can be purchased, but that is impossible with these pack sizes; both $8$ and $9$ are impossible.