
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 school wants to understand the learning situation of its students and decides to conduct a questionnaire survey using stratified sampling. From the first, second, and third grades with 600, 680, and 720 students respectively, 50 students are to be sampled. Calculate the number of students to be sampled from the first, second, and third grades.

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