Need some information about the rank system ,mmr and placements.

So i would like to know , if there's a way i can see in what elo i will be placed , without playing the 10 games now because i need more 4 champs to be able to play the ranked placement games . Like, in a website it shows that my mmr is equal to Silver IV , so, if i win the 10 placement games i go to Silver IV or something higher? Like, how do i preview what elo i will be placed on depending on how much games i win ? Hope u guys can understand.
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