There are 24 students in Ms. Woodall's. Half of the students are boys and 1/3 of the boys have brown hair. What's the number of boys who have brown hair in Ms. Woodall's class?
Well, we start with 24 students (as stated). We take that and divide it by 2 for the amount of BOIs. We get 12. Only 1/3 of them have brown hair, so divide 12 by 3 and we get 4. Your answer is 4.