
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 school has 5 groups participating in a tree planting activity, with an average of 13 trees planted per group, and that the first, second, third, and fifth groups planted 12, 15, 12, and 11 trees respectively, determine the number of trees planted by the fourth group.

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