The number of students in a school hall was 1000. The hall had 3 entrances A, B, and C which also served as the exits. If after a meeting 30% of the students went out of the building through exit A, 3/5 of the remaining went out through exit B, and the rest went out through exit C, calculate the number of students who went out through exit C.
The number of students who went out through exit A is 30/100%1000 = 300 students.
The number of students who didn't use exit A is 1000-300 = <<1000-300=700>>700
3/5 of the students used exit B, a total of 3/5*700 = <<3/5*700=420>>420 students.
If 420 of the remaining students who didn't use exit A used exit B, the number who used exit C is 700-420 = 280 students.
#### 280