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X and Y can do a piece of work in 20 days ...

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X and Y can do a piece of work in 20 days and 12 days respectively. X started the work alone and then after 4 days Y joined him till the completion of the work. How long did the work last?

  1. 12 days
  2. 19 days
  3. 10 days
  4. none of these
Asked By : SubramanianCategory : Time and Work
Answer
c. 10 days

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