Question

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

Answer 1

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.