Jim has 4 more brothers than sisters. how many brothers does his sister mary have

Well we need to know if Mary has any sisters to be 100% correct, but in assuming Mary is the only sister in the family, she would have 6 brothers. This us because Jim has 4 more brothers than sisters, and if Mary is the only sister that makes Jim have 5 brothers. Jim is also included as on of Mary's brothers besides the other 5. That makes it a grand total of 6 brothers.