I agree with Pop and Gritsar. There is no ideal, perfect, magic ratio for number of hens to roosters. There are so many factors involved that the answer will be different for each of us. If you can slog your way through these threads you'll get a lot of information about what you might expect. They are living animals and you cannot be assured of what will happen in any specific flock.
The rule of thumb lleighmay mentioned really concerns fertility of the hens only and is for full sized fowl. For bantams the ratio is around 12 to 15 hens to each rooster to assure fertility. If you read the first link, you can see that many people have much smaller rations without having problems. I've seen posts on this site that a flock had problems with one rooster and 18 hens. The number of hens and roosters in the flock is a factor, but in my opinion, it is a minor factor. In my opinion, age of the roosters and the hens, how much room you have, the personalities of the individuals involved, and size difference between hens and the roosters are much more important. But the ratio is a factor, not just for how often they mate the hens but other things too. That's why I usually advise to keep as few roosters as you can and still meet your goals.
Breeders managing roosters
https://www.backyardchickens.com/forum/viewtopic.php?id=250327
Number of roosters thread
https://www.backyardchickens.com/forum/viewtopic.php?id=219443
Managing multiple roosters
https://www.backyardchickens.com/forum/viewtopic.php?id=229968
Very briefly, you can expect things
might settle down as the roosters mature and get their hormones under better control and the pullets mature and start cooperating with the boys instead of resisting so strongly. But you might have a rooster that refuses to grow up and treat the girls with the respect they deserve. Or you might have a hen that will never accept the dominance of a rooster. Either one of these can really upset the happiness of your flock. I've gotten rid of hens and roosters for this reason.