If M and N represent the number of students admitted to Colleges S and Q respectively…

The table shows the number of students admitted (A) and the number who left (L) from five colleges P to T during 2016 to 2021; all five colleges were founded in 2016. In 2016 the numbers studying were P 2250, Q 2100, R 2400, S 3200 and T 3100. The admitted and left figures for later years are: 2017 P 660 and 440, Q 900 and 500, R 840 and 460, S 880 and 500, T 700 and 450; 2018 P 580 and 420, Q 650 and 430, R 800 and 500, S 800 and 520, T 760 and 460; 2019 P 690 and 400, Q 570 and 420, R 720 and 450, S 790 and 440, T 820 and 440; 2020 P 760 and 500, Q 600 and 380, R 680 and 480, S 840 and 450, T 880 and 420; 2021 P 700 and 460, Q 680 and 440, R 820 and 560, S 920 and 480, T 850 and 430. Based on the data, answer the questions.