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      Question

      Binny is 20% more efficient than

      Ankush, while Ankush is 50% more efficient than Raju. If the three of themтАФAnkush, Binny, and RajuтАФworking together can finish a task in 45 days, how many days will Binny need to complete 72% of the same task on his own?
      A 65.9 days Correct Answer Incorrect Answer
      B 22.5 days Correct Answer Incorrect Answer
      C 77.4 days Correct Answer Incorrect Answer
      D 89.5 days Correct Answer Incorrect Answer
      E None of these Correct Answer Incorrect Answer

      Solution

      ATQ,

      Let efficiency of Raju is 10x units per day Efficiency of Ankush = 1.5 ├Ч 10x = 15x units per day Efficiency of Binny = 1.2 ├Ч 15x = 18x units per day Total work = (10x + 15x + 18x) ├Ч 45 = 43x ├Ч 45 units Time taken by Binny alone = (0.72 ├Ч 43x ├Ч 45)/18x = 77.4 day

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