Practice question
Question
A wastewater has BOD of 1500 mg/L and COD of 2400 mg/L. Assuming 80% treatment efficiency in an activated sludge bioreactor, the BOD/COD ratio of treated effluent will be:
Explanation
quantitative reasoning analysis shows ratio, percentage and series logic determine correct calculation. Consequently 0.25 emerges as the valid choice since it meets mathematical and logical criteria, aligning with established principles in aptitude and reasoning literature.
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