Our team: two unranked, one of them is level 12, two Silver players and one Platinum
Enemy team: Two Platinum players, two Silver and one Gold
Let's assign a number score to each sub division, Iron 4 would be 1 point, Iron 3 would be 2 points, etc.
And let's assume that since Aatrox is level 12, he's at an Iron 4 level of skill and since Kha'Zix is 212, i'll give him a Silver 1, just assuming.
If you combine the sub division scores from both teams and divide it by 5 to get an average, our team was at the level of Silver 2 while theirs was at Gold 2. A full division higher elo than us.