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There is a reservoir of 800,000 tons of water. Currently, the reservoir is said to contain...

There is a reservoir of 800,000 tons of water. Currently, the reservoir is said to contain 0.25% of pollutants. 50,000 tons of water with 0.05% contaminant concentration flows into the reservoir every day, and the same amount of well-mixed water exits the reservoir every day. How long would it take for the concentration of pollutants in this lake to be below 0.1%?
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