The first answer is most likely to be correct
32 students would be on the trip. What I did to solve it was a proportion. 8students/ 3 chaperones= x students/12 chaperones.
8*12= 96 and 96/3=32. Therefore 32 students were on the trip.
8 * m - 2 = 8 * 4 - 2 = 30