A tank contains 1000 liters of brine. Brine containing 0.4 kg/liter of salt flows in at 10 liters/minute, and the mixture kept uniform by stirring, flows out at the rate of 15 liters/minute. If the concentration of the salt is 0.8 kg/liter at the end of 30 - minutes, how much was the concentration of salt at the beginning?

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