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      Question

      The current average age of Ayan, Rohit and Mohan is 27

      years, whereas the average age of Rohit and Mohan is 30 years. If Ayan is 5 years younger than Mohan, determine the average age of Ayan and Rohit.
      A 18 yrs Correct Answer Incorrect Answer
      B 22.5 yrs Correct Answer Incorrect Answer
      C 30 yrs Correct Answer Incorrect Answer
      D 27.5 yrs Correct Answer Incorrect Answer

      Solution

      ATQ,


      Total present age of Ayan, Rohit and Mohan = 27 × 3 = 81 years

      Total age of Rohit and Mohan = 30 × 2 = 60 years

      So, present age of Ayan = 81 - 60 = 21 years

      Since Ayan is 5 years younger than Mohan,

      Present age of Mohan = 21 + 5 = 26 years

      Then, present age of Rohit = 60 - 26 = 34 years

      Required average = (21 + 34) / 2 = 55 / 2 = 27.5 years

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