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      Question

      Sum of ages of 65 students is 1300 years. The average

      age of 25 of them is 16 years and the average age of another 20 of them is 14 years. Find the average age of the remaining students.
      A 29 years Correct Answer Incorrect Answer
      B 30 years Correct Answer Incorrect Answer
      C 31 years Correct Answer Incorrect Answer
      D 32 years Correct Answer Incorrect Answer
      E None of these Correct Answer Incorrect Answer

      Solution

      Given, sum of age of 65 students = 1300 years
      Sum of age of 25 students = 25 ร— 16 = 400 years
      Sum of age of another 20 students = 20 ร— 14 = 280 years
      Remaining number of students = 65 โ€“ 25 โ€“ 20 = 20
      Average age of remaining 20 students = {(1300 โ€“ 400 โ€“ 280)/20} = (620/20) = 31 years

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