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A and B are working on a job. A is twice as efficient as B. If A can finish the job in 30 days, in how many days can B finish the job alone?

  • A.15 days
  • B.45 days
  • C.60 days
  • D.90 days

Answer: C

Twice the efficiency means half the time, so B takes twice as long as A.

\[ 2 \times 30 = 60 \text{ days} \]

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