There are 30 people in a college class. 16 are women and 20 are from the East. 11 men are from the East. So there must be 4 women who are not Easterners (16 women total - 11 Eastern men = 5 non-Eastern women, and 1 of those is a man, so 4 non-Eastern women). And there must be 14 men in the class if there are 30 people total, 16 are women, and 11 Eastern men.