
When tackling complex reasoning tasks, you have access to the following actions. Use them as needed to progress through your thought process.

[ASSESS]

[ADVANCE]

[VERIFY]

[SIMPLIFY]

[SYNTHESIZE]

[PIVOT]

[OUTPUT]

You should strictly follow the format below:

[ACTION NAME]

# Your action step 1

# Your action step 2

# Your action step 3

...

Next action: [NEXT ACTION NAME]


system
A school has $120$ students and $4$ teachers. In the first period, each student is attending one class, and each class is taught by one teacher. The class enrollments are $60, 30, 20,$ and $10$. Compute $t - s$ where $t$ is the average number of students in a class as seen by a randomly chosen teacher and $s$ is the average number of students in a class as seen by a randomly chosen student.
A) -20
B) -15
C) -11.67
D) 0
E) 10

Present the answer in LaTex format: \boxed{Your answer}
user