
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
If there are a total of 100 infected individuals in a certain neighborhood, including 10 young people, 60 elderly people, and 30 children, and 20 individuals are randomly selected from them for testing using stratified sampling, then calculate the number of elderly people selected for testing.

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