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The efficiency of A, B and C are in the ...

The efficiency of A, B and C are in the ratio 5:6:9 working together, they can complete a work in 18 days. In how many days can B alone can complete 25% of that work?
A, B और C की कार्य क्षमता 5 : 6 : 9 के अनुपात में है | एक साथ कार्य करते हुए वे किसी कार्य को 18 दिनों में समाप्त कर सकते हैं |B अकेले इस कार्य का 25% भाग कितने दिनों में पूरा कर सकता है ?

A

18

B

10

C

15

D

16

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