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

  • (A) 20 days
  • (B) 15 days
  • (C) 6 days
  • (D) 10 days
  • Correct Answer - Option(D)
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