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The ratio of efficiencies of A , B and C...

The ratio of efficiencies of A , B and C is 3 : 5 : 1. Working together, they can complete a piece of work in 5 days. A and B worked together for 3 days. The remaining will be completed by C alone in :
A, B और C की कार्य क्षमता का अनुपात 3 : 5 : 1 है | एक साथ कार्य करते हुए, वे किसी कार्य को 5 दिनों में पूरा कर सकते हैं |A और B ने एक साथ 3 दिनों तक कार्य किया | C को अकेले शेष कार्य करने में कितना समय (दिन) लगेगा ?

A

18 Days

B

24 Days

C

21 Days

D

15 Days

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