Question: If initial Dissolved Oxygen ( DO ) and final DO after 5 days incubation at 2 0 deg C in 1 0 % dilution

If initial Dissolved Oxygen (DO) and final DO after 5 days incubation at 20\deg C in 10% dilution sample are 50 mg/L and 40 mg/L respectively, what is 5-day BOD of the same sample in mg/L

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