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A tank contains 4lb of salt dissolved in 95 gal of water suppose that brine containing 2lb of salt per gallon of brine is allowed

A tank contains 4lb of salt dissolved in 95 gal of water suppose that brine containing 2lb of salt per gallon of brine is allowed to enter the tank at a rate of 2t gal/min and that the mixed solution is drained from the tank at the same rate. Find the amount of salt in the tank after 60 minutes.

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