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ATQ,
Let the container's capacity be C liters. Initially, alcohol and water are in the ratio 4:7. After 25 liters of the mixture is drawn out and replaced with alcohol twice, the final ratio of water to alcohol becomes 121:167. Set up the equation for water remaining after two replacements:
Solving this equation gives C = 275 liters.
The capacity of the container is 275 liters.
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I. ...
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