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 Mr. Quarles have in total?

Answer 1

Let the total number of students that Ms. Quarles has be represented by \( x \).

According to the problem, Ms. Quarles grades 25% of the tests, which equals 30 papers. We can set up the following equation to express this relationship:

\[ 0.25x = 30 \]

To find \( x \), we need to solve the equation. First, we can multiply both sides by 4 to eliminate the decimal:

\[ x = 30 \times 4 \]

Calculating the right side gives:

\[ x = 120 \]

Thus, the total number of students that Ms. Quarles has is \( \boxed{120} \).