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Study the following graph carefully to answer the given questions

Q:

R started the work and left after some days, when 25% work was done. After it Z joined and completed it working for 25 days. In how many days R and Z can do the complete work, working together?

  • 1
    6
  • 2
    8
  • 3
    10
  • 4
    12
  • 5
    20
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Answer : 5. "20"

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