
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-quart tank is initially filled with a solution that is 25% antifreeze and 75% water. Four quarts of this mixture are removed and replaced with pure water. This replacement process is repeated three more times. Calculate the fractional part of the final mixture that is antifreeze.
A) $\frac{102}{500}$
B) $\frac{2048}{10000}$
C) $\frac{1024}{5000}$
D) $\frac{51}{250}$

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