
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
Apply stratified sampling to select a sample size of 45 from a school's population. If 20 students are to be selected from the first year and 10 from the third year, knowing that the second year has 300 students in total, determine the total number of students at the school.

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