
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
Use stratified sampling to select a sample of 45 students from a school, with 20 students from the first grade, 10 students from the third grade, and knowing that there are 300 students in the second grade. How many students are there in total in these three grades?

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