
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 $20$-gallon tank is filled with oil. Each time, $5$ gallons are removed and replaced with detergent. This process is repeated five times in total. What is the fractional part of the final mixture that is oil?
A) $\frac{243}{1024}$
B) $\frac{81}{256}$
C) $\frac{27}{64}$
D) $\frac{9}{16}$
E) $\frac{3}{4}$

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