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Questions & Answers about Tengo treinta preguntas.
Does the number treinta change to feminine since preguntas is a feminine word?
Is it wrong to say Yo tengo treinta preguntas?
If 21 is written as one word (veintiuno), is 31 written as a single word too?
No, the twenties are special! Numbers from 21 to 29 merge into a single word (like veintidós). But starting at 31, you use three separate words connected by y (and). For example, 31 is treinta y uno.
I recognize preguntas from the verb preguntar (to ask). Is it a verb or a noun here?