A tank contains 500 liters of brine. 12 liters of brine, each containing 2.5 N of dissolved salt, enter the tank per minute, and the mixture, assumed uniform, leaves at the rate of 8 liters/min. If the concentration is to be 2 N/liter at the end of one hour, how many newtons of salt should there be present in the tank originally?

A tank contains 500 liters of brine. 12 liters of brine, each containi

1.	A tank contains 500 liters of brine. 12 liters of brine, each containing 2.5 N of dissolved salt, enter the tank per minute, and the mixture, assumed uniform, leaves at the rate of 8 liters/min. If the concentration is to be 2 N/liter at the end of one hour, how many newtons of salt should there be present in the tank originally?
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