¿Cuántos libros son?
How many books are there?
Literally asking "How many books are?" The qualifier depends on who is asking whom the question where. You are holding a stack of books and some one asks this question, they are asking how many books you have. You are standing in a library and some one asks you that question while gesturing to the library, they are asking how many books are in the library.
how much is/are 2 and 2
how much is/are 2 and 2
It means "How many books for your classes this semester?"
How many are eight minus two?
"¿Cuántos idiomas sabes? ¿Cuáles son?" means "What languages do you know? What are they?"
La Biblia católica tiene 73 libros en total, incluyendo 46 del Antiguo Testamento y 27 del Nuevo Testamento.
Gibberish. Tu cuantos = Your how many Tú cuantos = You how many
"How many Kilometers are from Tamaulipas to Tabasco, Mexico?"
cuantos años TIENE how old are you
Saca los libros = Take out the books
¿Cuántos son cien menos treinta = What is 100 minus 30?
How much is thirty and three?