Percents and ratios

forty five percent of the students in a school are girls, Among the students who have traveled abroad earlier, 25% are girls, and among the ones who have not , 25% are boys. if the difference between the number of students who have traveled abroad and the number who have not is 105, what is the number of students in the school?

A) 852 B)754 C) 620 D) 525 E) 458

---