Final answer:
The number of students per van and per bus is 12 students per van and 55 students per bus.
Step-by-step explanation:
The number of students per van and per bus can be found by looking at the given options.
Option 1: 12 students per van and 55 students per bus
Option 2: 9 students per van and 50 students per bus
Option 3: 13 students per van and 59 students per bus
Option 4: 15 students per van and 60 students per bus
Therefore, the answer is:
- Option 1: 12 students per van and 55 students per bus