Okay, how does ranked actually work riot....

Upvote please until riot actually explains how placements actually work. Let's think about this logically guys, If I say.... win 10/10 games I should be at the very least promoted one rank. If I win 5/5 I should be placed in the exact same rank right? I've already read too many stories on the forums that simply ignore this obvious logic. So seriously riot, WHAT'S GOING ON!?!?!?
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