Question 9
Alice got on the school bus. At the stop after Sarah's, 7 students got on. Five students got on the bus at the next stop. At the last stop before the school, 9 students got on. When the bus arrived at school, 38 students got off. How many students were already on the bus when Sarah got on?
Self-study assumptions (editorial): treat Alice and Sarah as the same child; assume that only this child boards at that stop, there are no other unmentioned boarding or leaving events, and all students leave at school. Enter the number already aboard before that child boards.
Self-study assumptions (editorial): treat Alice and Sarah as the same child; assume that only this child boards at that stop, there are no other unmentioned boarding or leaving events, and all students leave at school. Enter the number already aboard before that child boards.