(quantifier / substitute pronoun)
Translations
The hall holds 150 people; a hundred were already seated when I arrived.
Зал вмещает 150 человек; когда я пришёл, сто уже сидели.
Definitions
Used alone to refer to the number 100 or a hundred people/things already mentioned or understood. There were dozens of candles; I lit a hundred for the ceremony.