What part of speech is cuantos?

"Cuántos" is an adjective in Spanish. It's the interrogative form of the adjective "cuanto", which means "how much" or "how many".

Here are some examples:

* ¿Cuántos libros tienes? (How many books do you have?)

* ¿Cuántas personas hay en la fiesta? (How many people are at the party?)

* ¿Cuánto dinero tienes? (How much money do you have?)

The form "cuántos" is used for masculine plural nouns, while "cuántas" is used for feminine plural nouns.