
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
Given that a certain school has 3000 students, the number of students from the first, second, and third grades participating in the running competition are in the ratio $a:b:c=2:3:4$, and $\frac{2}{5}$ of the total number of students participated in the mountain climbing competition. Calculate the number of students selected from the second grade participating in the running competition in a stratified sample of 300 students.

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