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