On monday, three hundred twenty students went on a trip to the zoo. all seven buses were filled and five students had to travel in cars. how many students were in each bus?

The way I see it, 325 students went to the trip and 5 had to go in cars so 325 - 5 = 320 then you devide it by 7 because that's the total number of buses which you should get 320/7 Which would equal to 45 students on each bus..

325 - 5 = 320/7 = 45

Hope this helps!
(Btw I rounded to 45 because the whole number was like 45.71428571428571)