Harriet knows how many students got off at one stop.
If Harriet has that information, she only need to divided the total amount of students by the number of students that got off at one stop. She can do this and find the answer because the number of students that get off is always the same in each stop.
For example, let's say that Harriet knows that at specific stop, 6 students got off. Then she divided 36/6=6, meaning that she made 6 stops in total. That's how she could find the total number of stops.
Step-by-step explanation: The only reasonable explanation would be 1 because you can't equally distribute more than 36 students in each amount of stop. Plus we don't even know how many it could be.
You just multiply the top and bottom numbers like it was two normal multiplication problems. Ex. 3/4x1/4=3/16 (3x1,4x4) But its different because you have to put them together to make a fraction (3/16).