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      Question

      Out of 840 students in a college, the proportion of boys

      to girls is 3:4. In the midterm exam, 15% of boys and 10% of girls failed. How many students failed?
      A 240 Correct Answer Incorrect Answer
      B 160 Correct Answer Incorrect Answer
      C 102 Correct Answer Incorrect Answer
      D 285 Correct Answer Incorrect Answer
      E None of these Correct Answer Incorrect Answer

      Solution

      ATQ,

      Number of boys = (3/7) × 840 = 360

      Number of girls = (4/7) × 840 = 480

      Required number of students = 0.15 × 360 + 0.10 × 480 = 54 + 48 = 102

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