Hit 50% W/R, Silver V ~68 LP
So, I recently hit Silver after climbing very quickly from Bronze 3 to Silver V in only two days or so. I've finally evened out my wins losses, so I'm wondering.. Is this my actual MMR/elo/Rank now? Or will I keep rising if I truly am a gold player? I don't expect to hit gold by the end of the season but I've been climbing rapidly after taking serious consideration into my champ pool and my attitude towards the game, so I'm wondering, if I actually am High Silver and I'm just not there yet? What will happen as I gain a positive win rate, is that when I potentially start jumping divisions?
I'm confused and I only ask because I saw someone else with a 50% W/R and they were Platinum, so like... how exactly does this work?