Hi everyone! could you tell me and correct my understandings about these sentences?
Situation-A group of 20 peoples is standing in front of me and I ask them.
Which one of you has a car?or Which of you has a car? (Are these both same? According to me these two mean
that I am asking about that one person who has a car? Is my understanding correct?
And now if I want to ask about more than one person who have cars in the group, how should I say this.
Here is my try-
Which peoples of you have cars.(Is it correct?) Please help me in this matter and tell me in which possible ways I can ask this question?
I'm not quite sure if there's a difference between which one of vs. which of you, I guess someone else has yet to clear up these ones (which one sounds better to my ears, though).

Anyway, by that sentence you're trying to find who, a specific person, out of those 20 people, has the keys. Basically you're already asking the group as a whole, you're not talking to only one person. Thus, your answer to another question is still this sentence. Oh, and it should be probably better to ask "Who has a car?"(the answer would be "Peter and Mike have cars." Or "Only I have.").

Also, using "peoples" is incorrect, "people" itself is already refering to a large group, it's a plural (the singular form is a "person"). Thus, the last sentence is incorrect, asking "Which people of you (...)" sounds to me as questioning "Which bananas out of all bananas are yellow" (not the best example ever, but what I want to tell, it's already clear to understand that you're addressing a large group, you already have a subject, no need to question it like this).

Hopefully it was somewhat clear.~
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Could You tell me whats the difference between these two?
Which of you has cars?(asking about one)
Which of you have cars?(asking about more than)
Which of you has done this?(asking about one)
Which of you have done this? (asking about more than one who have done this)