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Concentration of organic matter in a sealed water sample after remaining in dark for 4 and 8 days at 20 C is calculated to

Concentration of organic matter in a sealed water sample after remaining in dark for 4 and 8 days at 20 C is calculated to be 160mg/L and 60mg/L respectively. ? Calculate the concentration of organic matter remaining in the sewage sample after day 5 at 20 C.

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