xxx
xxx can point to thirty: ten more than twenty, three times ten, and the number that comes after twenty-nine and before thirty-one. In everyday number use, it may work like an adjective before a plural noun, as in “thirty apples” or “thirty minutes,” or as a noun naming the number itself. But xxx also raises a useful question: when is it just another way to represent 30, and when does XXX belong to a more specialized context, such as genetics? This lesson also touches on related forms like “thirtieth,” “in one’s thirties,” and “thirty-something.” Watch the full lesson to see how these uses fit together naturally.