
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
In a school, there are a total of 400 teachers, of which 250 are under 40 years old, and 150 are 40 years old and above. To check the prevalence of Mandarin proficiency among the teachers, a stratified sampling method is used to draw a sample of 80 teachers for a Mandarin proficiency test. The number of teachers under 40 years old that should be drawn for the sample is ______.

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