Answer: 400 students are girls
Explanation: To solve this problem, it's important to understand that 1/3 of 600 is 200 which means that approximately 33.3% of the students that are in the school are boys.
To find out how many girls are in the school, we need to subtract 200 from 600 or just 600 - 200.
600 - 200 = 400.
Therefore, 400 students who are in the school are girls.