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The Students in three classes are in the ratio 2 : 3 : 5. If 20 students join from new session in each class, the ratio changes to 4 : 5 : 7. The total number of students before the increase was?

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The Students in three classes are in the ratio 2 : 3 : 5. If 20 students join from new session in each class, the ratio changes to 4 : 5 : 7. The total number of students before the increase was?






 
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