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initially, a large tank with a capacity of 250 gallons contains 125 gallons of clean water....

initially, a large tank with a capacity of 250 gallons contains 125 gallons of clean water. A saline solution with a concentration of 4 pounds per gallon flows into the tank at a rate of 20 gallons per minute. the solution mixes perfectly well while drawing at a rate of 10 gallons per minute. Find: 1) the amount of salt in the tank at the time it fills up (in pounds) 2) the rate at which the salt comes out at that time (pounds per minute) 3) the amount of salt that has come out of the tank from the beginning and until that moment (pounds)
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