How many students were in the group initially?
A group of students decide to divide the $400 profit from their book sale among themselves. When they realize that there are three additional students with whom they must split the profits, they once again divide the $400 equally, and each students share of the profits decreases by $30. How many students were in the group initially?
Please explain how to solve problems like this, as well so that I know how to approach/ do similar ones in the future.