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      Question

      'Pooja' can complete a work in 28 days. She started the

      work and left after 14 days from starting. The remaining work was done by 'Ritika' in 21 days. Find the time taken by 'Ritika' to complete 50% of the work.
      A 25 days Correct Answer Incorrect Answer
      B 17 days Correct Answer Incorrect Answer
      C 21 days Correct Answer Incorrect Answer
      D 63 days Correct Answer Incorrect Answer

      Solution

      ATQ,
      Fraction of work completed by 'Pooja' = (14/28) = (1/2)
      Remaining work = 1 - (1/2) = (1/2)
      Time taken by 'Ritika' to complete (1/2)th of the work = 21 days
      Time taken by 'Ritika' to complete the whole work = 21 × (2/1) = 42 days
      Therefore, time taken by 'Ritika' to complete 50% of the work = 0.5 × 42 = 21 days

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