A and B can do a job in 7 days. A is \({ \text{1}}\frac{3}{4}\) times as efficient as B. The same job can be done by A alone in?
\(9\frac{1}{3}{ \text{days}}\)
11 days
\(12\frac{1}{4}{ \text{days}}\)
\(16\frac{1}{3}{ \text{days}}\)
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2
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3
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7
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