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Q:

The average mathematics marks of two Sections A and B of class IX 131 the annual examination is 74. The average marks of Section A is 77.5 and that of Section B is 70. The ratios of the number of students of Section A and B is:

  • 1
    7:8
  • 2
    7:5
  • 3
    8:7
  • 4
    8:5
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Answer : 3. "8:7"

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