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A is twice as efficient as B. Working together they complete a work in 8 days. How many days would A alone take?

Competition practiceTime & Work / Pipes
  • A10
  • B14
  • C12
  • D16

Step-by-Step Solution

Let B's rate be , A's be ; together , so . A's rate = 2/24 = 1/12, so A alone takes 12 days.
Answer: C) 12

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