A and B together do a job in 6.75 days and A could do the jo

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A and B together do a job in 6.75 days and A could do the job in 9 days if he worked alone. How many days would B take to do the job if he worked alone?

[2017 SSC CGL 19 AUG Shift-1]

A 27

B 18

C 24

D 21