For treatment of 25000 m3/day water, a dose of 10 kg/day of chlorine is applied. The residual chlorine after 10 minutes contact is 0.25 mg/l. What is the chlorine demand of the water?

1
0.40 mg/l
2
0.15 mg/l
3
10 mg/l
4
0.25 mg/l

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