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A is twice as efficient as B. Working together, A and B complete a piece of work in 8 days. How many days would A alone take to complete the work?

Competition practiceTime & Work / Pipes
  • A10
  • B16
  • C24
  • D12

Step-by-Step Solution

Let B' rate = , then A'; together , so and A' rate = , i.e. 12 days.
Answer: D) 12

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