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. The total number of students before the increase were

The students in three classes are in the ratio 2 : 3 : 5. If 20 studen

1.	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. The total number of students before the increase were
A.	10
B.	90
C.	100
D.	None of these
Answer» D. None of these