Answer:
8 vans
Explanation:
Two buses will carry 60 students each, so in total, the buses will carry 120 people. That means that the amount of students travelling in vans is equal to 190-120, which is 70.
To find out how many vans are needed, divide the amount of people by the amount of vans: 70/8=8.75. So 9 vans will be needed (8 vans will be full, one van will be 75% full)