Ms. Quarles gave the same math unit test all of her classes. She grades 25% of the tests, which is 30 papers. How many students does Ms. Quarles have in total?

Answer 1

If 30 papers represent 25% of the total number of students, then we can set up the following proportion:

30/0.25 = x/1

Solving for x, we get:
x = 30 / 0.25
x = 120

Therefore, Ms. Quarles has 120 students in total.