This is the 452nd most frequent Polish word.
ile
"How much" or "how many."
In this sentence, 'ile' is used to inquire about a numerical quantity, specifically someone's age.
Ile masz lat?
How old are you?
Here, 'ile' is used to ask about an unknown amount or numerical value, in this case, the cost of something.
Zastanawiam się, ile to kosztuje.
I wonder how much this costs.
In this context, 'ile' is asking about the quantity of entities, specifically the number of people who attended the meeting.