My question is why men are allowed to marry more than one women?which kind of justice he should do between his wives?what is there any punishment if he cannot do justice?please answer these question in the light of quraan and hadith.thank you.

Walekumslaam.in islam a man can marry 4 women only if the woman can not afford to feed her self or if she has been widowed there might be many more reasons a man can marry 4 women. He should treat them all equally and support them equally if not he should not marry.firstly before his second marriage he should ask his first wife and take permission.