A and B can do a job together in 7 days....

A and B can do a job together in 7 days. A is `1 3/4` times as efficient as B. the same job can be done by A alone in: `9 1/3d a y s` b. `11\ d a y s` c. `12 1/4` d. `16 1/3\ d a y s`

`(49)/(4)` days

`(49)/(3)` days

11 days

`(28)/(3)` days

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