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Question Number 194599 by pete last updated on 10/Jul/23

$$\mathrm{A}\mathrm{tank}\mathrm{contains}300\mathrm{litres}\mathrm{of}\mathrm{fluid}\mathrm{in}$$$$\mathrm{which}20\mathrm{grams}\mathrm{of}\mathrm{salt}\mathrm{is}\mathrm{dissolved}.$$$$\mathrm{Brine}\mathrm{containing}1\mathrm{gm}\mathrm{of}\mathrm{salt}\mathrm{per}\mathrm{litre}$$$$\mathrm{is}\mathrm{then}\mathrm{pumped}\mathrm{into}\mathrm{the}\mathrm{tank}\mathrm{at}\mathrm{a}\mathrm{rate}$$$$\mathrm{of}4\mathrm{L}/\min ;\mathrm{the}\mathrm{well}\mathrm{mixed}\mathrm{solution}$$$$\mathrm{is}\mathrm{pumped}\mathrm{out}\mathrm{at}\mathrm{the}\mathrm{same}\mathrm{rate}.$$$$\mathrm{Find}\mathrm{the}\mathrm{number}\mathrm{N}\left(\mathrm{t}\right)\mathrm{of}\mathrm{grams}\mathrm{of}$$$$\mathrm{salt}\mathrm{in}\mathrm{the}\mathrm{tank}\mathrm{at}\mathrm{time}\mathrm{t}.$$

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