
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
The amount of algae in Johnson's local lake increased by doubling each day. By the end of day 30, the lake was wholly covered with algae. Determine the specific day on which only 10% of the lake was covered in algae.

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