
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
During the 2014 APEC Leaders' Meeting, a group of college student volunteers affectionately nicknamed "The Smurfs" was involved in the service. It is known that the ratio of the number of associate degree students, undergraduate students, master's students, and doctoral students among the volunteers is 5:15:9:1. If a stratified sampling method is to be used to draw a sample of 120 people for a survey from these volunteers, then the number of master's students that need to be sampled is ______.

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