Question :
There are two examinations rooms A and B. If 10 students are sent from A to B, then the number of students in each room is the same. If 20 candidates are sent from B to A, then the number of students in A is double the number of students in B. The number of students in room A is:
1. 20
2. 80
3. 100
4. 200
Answer :
3 - 100
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