
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
To understand the scores of the senior high school mathematics mock examination in School A, B, and C in a certain city, a stratified sampling method is used. The samples are taken from 1260 exam papers in School A, 720 exam papers in School B, and 900 exam papers in School C. If 45 exam papers were drawn from the 900 exam papers of School C, how many exam papers were checked in total during this survey?

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