
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
To estimate the number of fish in a pond, 200 fish were caught and marked, then released back into the pond. After some time, when the marked fish were completely mixed with the rest of the fish, 100 fish were caught again. If 10 of them were marked, estimate the total number of fish in the pond.

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