That's another good example. Until you tell them the test isn't about real people, they can easily construct narratives where the answer is different than the 'right' one. Maybe they know a Juanita with an apple tree, that will let you pick your own. Maybe they always cut up apples at home so everybody gets half an apple, and the rest are put in the fridge for later. And so on.

Thanks for illustrating the problem so neatly!