A tank contains 400 Liters of brine. Twelve liters of brine, each containing 2.5 lb of dissolved salt, enter the tank per minute, and the mixture assumed uniform, leaves at the rate of 8 Liters per minute. If the concentration is to be 2 Ib/L at the end of one hour, how many pounds of salt should there be present in the tank originally? O 160 lb O 140 lb O 180 lb O 200 lb

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