A pond initially contains 1000 litres of unpolluted water.
The pond is leaking at a constant rate of 20 litres per day.
It is suspected that contaminated water flows into the pond at a constant rate of 25 litres per day and that the contaminated water contains 2 grams of pollutant in every litre of water.
It is assumed that the pollutant instantly dissolves throughout the pond upon entry.
Given that there are grams of the pollutant in the pond after days,
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