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      Question

      Find the ratio of the number of teachers of school D and

      ‘b’. Read the following information carefully and answer the questions given below. The Line graph given below shows the difference between the number of students and teachers of four different schools (A, B, C and D). Also the table given below shows the number of students and ratio of students and teachers of each school. (Note: n > m)
      A 10:17 Correct Answer Incorrect Answer
      B 31:22 Correct Answer Incorrect Answer
      C 16:23 Correct Answer Incorrect Answer
      D 25:39 Correct Answer Incorrect Answer
      E None of these Correct Answer Incorrect Answer

      Solution

      In school A, Let number of students and teachers be 5x and 3x respectively. Now, 5x – 3x = 400 => x = 200 Total number of students = 5x = 1000 Total number of teachers = 3x = 600 Now, 2a = 1000 => a = 500 In school B, Let number of students and teachers be 7x and 9x respectively. Now, 9x – 7x = 320 => x = 160 Total number of students = 7x = 1120 Total number of teachers = 9x = 1440 Now, b + 340 = 1120 => b = 780 In school C, Here, m = 90 => n – m = 160   [n > m given] => n – 90 = 160 => n = 250 Total number of students = 90 Total number of teachers = 250 In school D, Let number of students and teachers be 4x and 5x respectively. Now, 5x – 4x = 100 => x = 100 Total number of students = 4x = 400 Total number of teachers = 5x = 500 Now, c2 = 400 => c = 20 Required ratio = 500 : 780 = 25:39

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