In a mini bus a maximum of 15 students can sit and three times of that can sit in a big bus. 112 students want to go for a trip such that each student should occupy exactly one seat. What is the minimum number of vehicles they require?
1
2 mini buses and 2 big buses
2
1 mini bus and 2 big buses
3
3 mini buses and 1 big bus
4
4 mini buses and 1 big bus