Discussion :: Time and Work
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A and B can do a job together in 7 days. A is 1
times as efficient as B. The same job can be done by A alone in :
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Answer : Option B
Explanation :
| (A's 1 day's work) : (B's 1 day's work) = | 7 | : 1 = 7 : 4. |
| 4 |
Let A's and B's 1 day's work be 7x and 4x respectively.
| Then, 7x + 4x = | 1 |  11x = | 1 | x = | 1 | . |
| 7 | 7 | 77 |
 A's 1 day's work = |  | 1 | x 7 |  | = | 1 | . |
| 77 | 11 |
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