An unforced Halloween error

The Reese’s Cups Snack Size package shows “approximately” twenty servings per package. We had nine trick-or-treaters and gave out eighteen cups, so I assumed we had about twenty-two cups left over. But when trick-or-treating ended, our orange pail still held a lot of candy.

So I counted. We have thirty-seven cups left over. Which means that a package has not approximately twenty but twenty-five to thirty cups. And a serving must be somewhere between one and two cups. My original caculation was an unforced Halloween error.