The proportion of students in the three classes is 3 : 4 : 5. If the n – McqOptions

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1.	The proportion of students in the three classes is 3 : 4 : 5. If the number of students is increased by 20 in each class, then the proportion changes to 4 : 5 : 6. What is the initial number of students in the three classes taken together?
A.	300
B.	280
C.	320
D.	240
Answer» E.

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