
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 story of "Cao Chong weighing an elephant" is a widely circulated folk tale in China. In the story, the method of weighing the elephant is as follows: first, lead the elephant onto a boat and mark the water level on the side of the boat. Then, lead the elephant off the boat and lift $20$ blocks of equally weighted rectangular stones onto the boat. Leave $3$ workers on the boat. At this point, the water level is exactly at the marked position. If another block of the same rectangular stone is lifted onto the boat, leaving only $1$ worker on the boat, the water level remains unchanged at the marked position. If the weight of each block of rectangular stone is $240$ catties, what is the weight of the elephant? (Assume each worker has the same weight)

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