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      Question

      A school has 720 students. The ratio of boys to girls is

      4:2. Among the boys, the passed to failed ratio is 9:3. Among the girls, the passed to failed ratio is 6:2. Find how many students passed the exam.
      A 760 Correct Answer Incorrect Answer
      B 615 Correct Answer Incorrect Answer
      C 540 Correct Answer Incorrect Answer
      D 375 Correct Answer Incorrect Answer
      E None of these Correct Answer Incorrect Answer

      Solution

      ATQ,

      Number of boys = (4/6) ร— 720 = 480

      Number of girls = (2/6) ร— 720 = 240

      Required number of students = (9/12) ร— 480 + (6/8) ร— 240 = 360 + 180 = 540

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