A can do a certain job in 36 days. When A and B work together, they can do the same job in 9 days. Thus, B is: 

A can do a certain job in 36 days. When A and B work together, they can do the same job in 9 days. Thus, B is: 
1). As efficient as A 
2). Twice as efficient as A
3). Thrice as efficient as A
4). Four times as efficient as A

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