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The proportion of the number of students...

The proportion of the number of students in three classes is 1 : 2 : 3. If 20 students are included in each class, then the proportion becomes 3 : 5 : 7. What was initially the total number of students in the three classes?

A

240

B

220

C

200

D

280

Text Solution

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The correct Answer is:
A
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