How to KILL Your Brain-fog in Examination Hall #shorts

Seema is desperate to score A+ grade in examination. As she enters the examination hall and the examination begins, she becomes extremely nervous. Her feet go cold, her heart starts pounding and she is unable to answer properly. The primary reason for this is that

There are two examination halls P and Q. If 10 students shifted P to Q, then the number of students will be equal in both the examination halls. If 20 students shifted from Q to P,then the students of P would be doubled to the students of Q. The numbers of students would be in P and Q, respectively are