What is the spanish phrase for how meany

Cuántos is your answer. Hope it helps! :)

Cuántos
It means how many in the spanish language 
lol i just wrote the last line cuz i needed to write more characters

Ellos tenian una bonita relacion pero hubo momentos donde ellos tenian adversidades pero sin embargo,ellos pudieron ser felicez.

Pedro, josie, y heather fue a la quinceañera de virginia. the question is asking who went to the quinceañera. the person answering the question should answer using the ellos, ellas, and ustedes form if they were not part of that group of people.