
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 biologist wants to estimate the population of turtles in a pond. On June 1st, she captures and tags 90 turtles, then releases them back into the pond. On November 1st, she captures another sample of 50 turtles, of which 4 are found to be tagged. She assumes that 30% of the turtles are no longer in the pond due to natural causes and that 50% of the turtles in the November sample were not present in June due to new hatchlings. What is the biologist's estimate of the number of turtles in the pond on June 1st?

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