engineering recuitment UPPSC AE Mock Test 2024 Environmental Engineering Sewage Sewage Treatment

The dissolved oxygen in water changes form 9 mg/1 to 3 mg/l after 5 days. If the dilution factor is 3:50, then what will be the BOD; (in mg/1) of the solution?  

1
50
2
100
3
150
4
200
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