The following question is accompanied by two statements (I) and (II). You have to determine which statement(s) is/are sufficient/necessary to answer the questions.

Find the number of boys in the college, if 60% of boys and 40% of girls participated in an event. (If number of boys are equal to the number of girls).

I. The number of girls participated in the event is 120 less than the number of boys. 

II. The number of girls in the college is 25% more than that of the boys participated in the event.