
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
The number of students in grades 10, 11, and 12 in a certain school is 1000, 1200, and 1500, respectively. A stratified sampling method based on grades is used to understand the vision health status of the students. It is known that 75 students were surveyed in grade 12. How many students were surveyed in total for the three grades?

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