General Knowledge MCQs
Q 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?
  • A A. 6 days
  • B B. 10 days
  • C C. 15 days
  • D D. 20 days
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