A 400-gallon capacity tank initially contains salt solutions consisting 150 gallon of water and 25 Ibs of salt. The salt solution containing 2 lb of salt per gallon is allowed to enter the tank at a rate of 10 gal/min and leaves at a rate of 5 gal/min. Find the amount of salt in the tank at the end of 30 minutes.    ans: Q(30)= 462.5

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