Ms. Quarles gave the same math unit test to all her classes she grades 25% of the tests which is 30 papers how many students does Ms Quarles have in total?
Ms. Quarles has a total of 120 students.
This can be calculated by dividing the total number of graded tests (30) by the percentage of tests she grades (25%).
30 / 0.25 = 120
Therefore, Ms. Quarles has 120 students in total.