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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:

(A) 20

(B) 80

(C) 100

(D) 200
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Satement::1 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.

A-10=B+10

Satement::2 If 20 candidates are sent from B to A, then the number of students in A is double the number of students in B.

A+20 = 2(B-20)

Solving both equations, we get A=100 and B=80

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