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      Question

      If Chinky worked for whole time and Arjun & Bheem work

      alternatively with Chinky, then what will be the minimum number of required days to complete the work. The ratio of number of days taken by Arjun and Bheem to complete a work individually is 7:8 and the ratio of number of days taken by Bheem and Chinky to complete a work individually is 6:7 and the ratio of number of days taken by Chinky, Danny, Elli and Finn to complete a work individually is 28 : 30 : 35 : 40. Arjun takes 21 days to complete a work individually.
      A (80/7) days Correct Answer Incorrect Answer
      B (17/7) days Correct Answer Incorrect Answer
      C (85/7) days Correct Answer Incorrect Answer
      D (87/7) days Correct Answer Incorrect Answer
      E none of these Correct Answer Incorrect Answer

      Solution

      ATQ, we can say that Let 2 days work = 2 × 30 + 40 + 35 = 135 unit  12 days work = 12/2 × 135 = 810 unit  Number of days will be minimum when person of higher efficiency work on last day with C,  Hence remaining (840 – 810 = 30 unit) work complete by C & A in =  30/(30 + 40) = 3/7 days  Total work complete in = (87/7) days

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