
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 researcher in a botanical garden documented the heights of 5 sequential trees. The height of each tree either increases by 5 meters or decreases by 3 meters compared to the previous tree on its left. The height of Tree 2 is 15 meters; calculate the average height of these trees.

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