ACT Practice Question: Problem Solving Skill

Try this ACT math practice question that tests your general problem solving skill.

99 people are sitting in 23 vans. Each van can seat at most 6 people. What is the greatest possible number of vans with exactly one person sitting in it?

1. $\quad 6$
2. $\quad 7$
3. $\quad 8$
4. $\quad 9$
5. $\quad 10$