In an examination, P, Q, R, and S each scored different marks. Q scored more than R and S. No one scored less than P. Who among them scored the maximum marks?

In a row of people facing north, P is 2nd from the right end and Q is 7th from the right end. Q is exactly between P and R. If R is 5th from the left end of the row, how many people are there in the row?

A, B, C, D, E, and F are six toppers of a university who scored different marks. The one scoring the highest marks is given rank 1 and the one scoring the least marks is given rank 6. C scores more marks than A and E, but scores less marks than the other toppers. F scores more marks than B, but less than D. Who among the following ranks third?