120 students
To find the total number of students in all of Ms. Quarles' classes, we can set up a proportion using the number of tests she grades (30) as a percentage of the total number of students.
30 tests / X total students = 25% / 100%
By cross multiplying, we get:
30 * 100% = X * 25%
3000 = 0.25X
X = 3000 / 0.25
X = 120
Therefore, Ms. Quarles has a total of 120 students in all of her classes.
Ms. Quarles have 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?(1 point) n=
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