In a city the ratio of the drainage to sewage is 20, the percentage discharge passing through non-monsoon periods, is
A. 5
B. 10
C. 15
D. 20
Answer: Option D
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Qd/Qs=20.
So, Qd=20xQs.
Q= Qd+Qs.
Q= 20Qs+Qs. = 21Qs.
Explain