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      Question

      Determine the number of Girls  in a school of 60

      Student  when you know that the average weight of all Student  is 50 kgs, the average weight of boys is 65 kgs, and the average weight of Girls  is 45 kgs.
      A 28 Correct Answer Incorrect Answer
      B 25 Correct Answer Incorrect Answer
      C 45 Correct Answer Incorrect Answer
      D 16 Correct Answer Incorrect Answer
      E none of these Correct Answer Incorrect Answer

      Solution

      ATQ, Desired ratio =  3:1 Ratio of number of boys And  girls = 1:3 Number of girls in the school is  = (3/4) × 60 = 45

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