engineering recuitment PPSC JE Civil Mock Test 2022 Environmental Engineering Water Supply

If the BOD of a diluted sample in 1 : 100 ratio is 11 PPM in the beginning and 8 PPM at the end of 5 days, then the BOD of the sample is

1
300 PPM
2
950 PPM
3
137.5 PPM
4
73 PPM
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