How many wins do I need to get from Iron 3 to Silver?

With a 55% win rate, you need to play 280 games, win 154 of them and lose 126.

With a 60% win rate, you need to play 140 games, win 84 of them and lose 56.

With a 65% win rate, you need to play 93 games, win 60 of them and lose 33.

With a 70% win rate, you need to play 70 games, win 49 of them and lose 21.