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      Question

      Raj alone can complete a work in 25 days. Mohan is five

      times as efficient as Raj. Find the percentage of work completed by Raj and Mohan together in 5 days.
      A 43% Correct Answer Incorrect Answer
      B 60% Correct Answer Incorrect Answer
      C 80% Correct Answer Incorrect Answer
      D 120% Correct Answer Incorrect Answer

      Solution

      ATQ,

      Let the efficiency of Raj = x units/day

      Total work = 25x units

      Efficiency of Mohan = x × 5 = 5x units/day

      Work done by Raj and Mohan together in 5 days = (x + 5x) × 5 = 30x units

      Percentage of work done = (30x / 25x) × 100 = 120%

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