
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
Jeff caught 21 fish, each having a mass of at least $0.2 \mathrm{~kg}$. He noticed that the average mass of the first three fish that he caught was the same as the average mass of all 21 fish. The total mass of the first three fish was $1.5 \mathrm{~kg}$. What is the largest possible mass of any one fish that Jeff could have caught?

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