<em>Your question seems to be written in a confusing way so I am assuming that the question is:</em>
<em>325 people were part of a natural group, six buses were completely filled and 7 people chose to walk how many people did the bus hold?</em>
To find out how many people were taking the bus, we needed to subtract the walking people from all the people.
325 - 7 = 318
318 people had to ride the buses.
Now again since the question is written weird, I dont know if you want to find ut only the people riding the buses, or how many people on each of the six buses. Because of this below I will show how many peope per bus:
Now since we know 318 people are riding the buses, we need to split those people among the six buses.
318 ÷ 6 = 53
53 people were in each bus.