Differential Equations: differential equations – #27831

Question: A tank with a 1000-gal capacity initially contains 500gal of water that is polluted with 50lbs of particulate matter. At time t=0, pure water is added at a rate of 20gal/min and the mixed solution is drained off at a rate of 10gal/min. How much particulate matter is in the take when it reaches the point of overflowing?

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