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      Question

      There are 25 students in a class with an average age of

      20 years. 5 more students join the class, reducing the average to 18 years. Find the average age of the new students.
      A 6 years Correct Answer Incorrect Answer
      B 7 years Correct Answer Incorrect Answer
      C 8 years Correct Answer Incorrect Answer
      D 9 years Correct Answer Incorrect Answer

      Solution

      Initial sum = 25 × 20 = 500 years
      New average = 18 years
      New strength = 30
      New total = 30 × 18 = 540 years
      Age of new = 540 - 500 = 40 years
      Average = 40 ÷ 5 = 8 years

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