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A and B together do a job in 12 days and...

A and B together do a job in 12 days and A could do the job in 20 days if he worked alone. How many days would B take to do the job if he worked alone? (A) 30 days (B) 25 days (C) 24 days (D) 15 days

A

C

B

A

C

D

D

B

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