brine containing 3 lbs./gal of salt enters a large tank at the rate of 2 gals/minute and the mixture well stirred leaves at 1.5gal / m * i * n * l . if the tank contains initially 100 gal of water, with 4 lbs. of dissolved salt. a) find the amount of salt in the tank at any time t in minutes. b) find the amount of salt in the tank after 4 minutes.
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