
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
Last year, 40% of the birds around Ridgewood Lake were ducks, 20% were swans, 15% were eagles, and 25% were sparrows. What percent of the birds that were not swans were ducks?
A) 20%
B) 40%
C) 50%
D) 60%
E) 80%

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