Answer:
Cuantos estudiantes hay en el aula?
Explanation:
They are asking how many students are in the school. When there is a lot of something or someone, always add an s.
Answer: ¿Cuántos estudiantes hay en el aula?
Translation: How many students are there in the classroom?
Explanation:
In Spanish, interrogative adjectives are used before countable and uncountable nouns and must always match in gender and number with the noun about which they interrogate. Since "estudiantes" is a masculine and plural noun, its adjective must also be masculine and plural: ¿Cuántos". This word has a written accent, because in Spanish all the interrogative words have a written accent.
