$40$ students are going on a field trip to the aquarium. Every student needs to be in a group, and all groups must have the same number of students. **If there is $1$ group, there will be [[☃ math-keypad 1]] students in the group.** **If there are [[☃ math-keypad 2]] groups, there will be $20$ students in each group.** **If there are $4$ groups, there will be [[☃ math-keypad 3]] students in each group.**