
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
Using stratified sampling, a sample of 55 students is selected from a high school to participate in a questionnaire survey. Among them, 10 students from the first year and 25 students from the second year are selected. If there are 400 students in the third year of the school, then the total number of students in the first and second years of the school is ▲ people.

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