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      Question

      The average age of 30 employees is 28 years. If x new

      employees join with an average age of 35 years, the overall average rises by 1 year. Find x.
      A 5 Correct Answer Incorrect Answer
      B 12 Correct Answer Incorrect Answer
      C 10 Correct Answer Incorrect Answer
      D 18 Correct Answer Incorrect Answer

      Solution

      ATQ, 30 * 28 + x * 35 = (30 + x) * (28 + 1) 840 + 35x = (30 + x) * 29 35x тАУ 29x = 870 тАУ 840 6x = 30 x = 5

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