
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 pipe burst occurred on the riverbank, causing river water to continuously gush out. Assuming the amount of water gushing out per minute is constant, if 2 pumps are used to pump out the water, it can be done in 40 minutes; if 4 pumps are used, it can be done in 16 minutes. To pump out the water within 10 minutes, at least how many pumps are needed?

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