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Consider a lake that is fed by mix of two streams: one stream has a flow...

Consider a lake that is fed by mix of two streams: one stream has a flow rate of N m3/s and BOD concentration of 10 mg/L. The other is a sewage outfall that discharges 0.6 m3/s and a BOD concentration of 40 mg/L. Assuming the pollution is completely mixed in the stream, find the resulting BOD concentration

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