How many classes are there in many trains?

How many classes are there in many trains, Joan? - Two: first and second class.
¿Cuántas clases hay en muchos trenes, Joan? - Dos: primera y segunda clase.
How many classes are there in many trains? - There are usually two classes.
¿Cuántas clases hay en muchos trenes? - Generalmente, hay dos clases.
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