
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
A clothing design company has 1200 employees, among which the ratio of elderly, middle-aged, and young employees is 1:5:6. For the company's 10th anniversary celebration, 5 local singers and 36 employees from the company were specially invited to perform on stage together. The employees were selected through stratified sampling based on their age groups. The number of middle-aged employees participating in the performance is __________.

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