Setup

P, Q, R, S, and T sit in a row facing north.

Clues

1. P sits at the left end.
2. T sits at the right end.
3. Q sits immediately to the right of P.
4. R sits immediately to the left of T.

Question

Who sits in the middle?

Answer

S sits in the middle.

Solution

1. P and Q occupy positions 1 and 2.
2. R and T occupy positions 4 and 5.
3. S is the only person left for position 3.