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      Question

      The average age of (x + 6) students of a class is 16 years.

      If the 40 years old class teacher is also included then average age of the class gets increased by one year. Find x% of 600.
      A 96 Correct Answer Incorrect Answer
      B 102 Correct Answer Incorrect Answer
      C 108 Correct Answer Incorrect Answer
      D 114 Correct Answer Incorrect Answer
      E 120 Correct Answer Incorrect Answer

      Solution

      Total age of students = 16(x + 6) years
      According to question,
      [16(x + 6) + 40] = (16 + 1)(x + 6 + 1)
      16x + 96 + 40 = 17x + 119
      17x тАУ 16x = 136 тАУ 119
      x = 17
      So, 17% of 600 = 102

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