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  3. a quantity of water contains 1000g of polluntants each time...

Question: a quantity of water contains 1000g of polluntants each time...

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a quantity of water contains 1.000g of polluntants. each time the water passes through filter, 18% of the pollutants are removed. How many filters are needed to reduce the mass of pollutant to less than 250g? show all your work.

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