The bus driver made 6 stops on his way into town. No passengers left the bus. By stop 3, there were 9 passengers on the bus. How many passengers were on the bus by stop 5? A.2 B.5 C.9 D.22
I think the question is trying to say that 3 passengers get on the bus at every stop. That makes 9 after the third stop, and it would be 15 after the 5th stop.