the r a t i o n a girls to boys in the school is 321 and there is a total of 400 students how many are boys the answer must be a whole number

Let's solve this problem step by step:

1. The ratio of girls to boys in the school is 3:2.
2. This means that for every 3 girls, there are 2 boys.
3. The total number of students in the school is 400.
4. To find the number of boys, we need to determine the number of parts the ratio represents.
5. The total number of parts in the ratio is 3 + 2 = 5.
6. To find the number of boys, we divide the total number of students (400) by the total number of parts (5).
7. 400 / 5 = 80.
8. Therefore, there are 80 boys in the school.