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      Question

      The number of students in class 'A' is 108, and the ratio

      of girls to boys is 5:4. If the average number of boys in classes A and B is 114, and the average number of girls is 129, find the total number of students in class B.
      A 378 Correct Answer Incorrect Answer
      B 366 Correct Answer Incorrect Answer
      C 384 Correct Answer Incorrect Answer
      D 372 Correct Answer Incorrect Answer
      E 390 Correct Answer Incorrect Answer

      Solution

      Number of girls in class A = (5/9) × 108 = 60
      Number of boys in class A = (4/9) × 108 = 48
      Number of boys in class B = 114 × 2 - 48 = 228 - 48 = 180
      Number of girls in class B = 129 × 2 - 60 = 258 - 60 = 198
      Total number of students in class B = 180 + 198 = 378

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