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Filling a Tank with Water.

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Water fills a tank at a rate of 150 litres during the first hour, 350 litres during the second hour, 550 litres during the third hour and so on. Find the number of hours necessary to fill a rectangular tank 16m x 9m x 9m.

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The expert examines filling a tank with water.

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Let be the water in the tank after hours, be the water added to the tank during the hour and be the number added ti the tank ...

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