How does ranked work? Honest question.

Not a rage post or anything, I just really want to know.

In my placements, I won 6 games and lost 4.

1st game - Brand Support: 4/8/3 -Loss 2nd game - Brand Support: 9/4/15 -Win 3rd game - Brand Support: 8/2/10 -Win 4th game - Brand Support: 6/4/14 -Win 5th game - Brand Support: 10/0/13 -Win 6th game - Brand Support: 4/7/6 -Loss 7th game - Brand Support: 6/7/15 -Win 8th game - Brand Support: 16/9/7 -Loss 9th game - Quinn ADC: 17/15/15 -Loss 10th game - Brand Support: 5/5/12 -Loss

Alright, I didn't do to great. I got put in Bronze 5. My friend on the other hand got put in Silver 1. Here are his games. He won 4 and lost 6.

1st game - Nami Support: 0/6/3 -Loss 2nd game - Anivia Mid: 3/4/5 -Loss 3rd game - Vel'Koz Mid: 5/6/4 -Loss 4th game - Kennen Top: 8/5/10 -Win 5th game - Kennen Top: 6/6/7 -Win 6th game - Annie Support: 4/7/22 -Win 7th game - Vlad Mid: 3/10/7 -Loss 8th game - Annie Support: 2/9/5 -Loss 9th game - Annie Support: 2/9/4 -Loss 10th game - Talon Mid: 14/9/2 -Win

So what am I doing wrong? I went positive in more games, got more kills in more games, won more games... why am I placed in Bronze 5?

Does playing different champions have something to do with it? I can play every roll, and I have champs I like playing for every roll so that's not an issue. I just don't really understand it is all.

EDIT: Well, despite the awkward hate in the comments... I guess I don't really agree with how placements work. Ideally, they'd be more or less based on individual performance as well as what your rank was last year. But hey, it's whatever.

I'll continue stomping peeps in bronze I guess.