Study the given pie charts and answer the question that follows. The pie charts show the distribution of students of graduate and postgraduate levels in five different institutes P, Q, R, S and T in a town.
(i) Total number of students of graduate level in five different institutes = 12400

(ii) Total number of students of post graduate level in five different institutes = 8000

The ratio of the number of students of graduate level in Institutes P and S together to that of post graduate level in institutes P and is: