
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
There are some people in the northern village, 400 people in the western village, and 200 people in the southern village. A total of 60 people need to be conscripted from these three villages, with 10 people from the northern village. Using stratified sampling, calculate the number of people in the northern village.

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