
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 certain school has 1600, 1200, and 800 students in grades 10, 11, and 12, respectively. To understand the dental health status of high school students in the school, stratified sampling is conducted according to the number of students in each grade. If 20 students are sampled from grade 12, then the total number of students that need to be sampled from grades 10 and 11 is ______.

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