breeding of mollies

Question
I have seven female and three male mollies[one of them is balloon mollie] . the three male mollies always try to mate with a single female molly [which is the largest one] ,but nothing happened to the female one .Iam not finding any solution because it hasn't given any birth.

Answer
John,
have  you added any salt to the tank as mollies are actually brackish water fish and do very well in actual salt water.
Keep the temp up around 80f and feed greens along with the food you are feeding.
regular water changes are key as well.
Mollies, contrary to popular belief as pushed by most pet shops are not the easiest fish to keep at there peak condition.
That said, some salt, non iodized, greens, correct temp and regular water changes will get you where you need to be.
Good luck and enjoy your fish.
Mike