6. The students in three classes are in the ratio of 2:3:5 if 40 students are increased in
each class the ratio changes to 4:5:7 if 40 students are increased in each class the ratio
changes to 4:5:7 originally the total number of students was _______
(A) 100
(B) 180
(C) 200
(D) 400
Ans (C)
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