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1) they have 5 meals a day.

Yes,

Общий: Do they have 5 meals a day?

Альтернативный: Do they have 5 or 4 meals a day?

Разделительный: They have 5 meals a day, don't they?

Специальный: How often do they have 5 mea/s

Вопрос к подлежащему: Who has 5 meals a day?

Ответ: Yes, they do. (Do they have 5 meals a day?)