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Q:

The students in three classes are in the ratio 2 : 3 : 5. If 20 students are increased in each class, the ratio changes to 4 : 5 : 7 . originally the total number of students was: 

  • 1
    100
  • 2
    150
  • 3
    50
  • 4
    90
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Answer : 1. "100 "

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