
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
There are 15 students taking both geometry and biology. There are 40 students taking geometry, and there are 20 students who are taking only biology. How many students are taking geometry or biology but not both?

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