, Q, R, S, T and U live on six different floors of the same building. The lowermost floor in the building is numbered 1. the floor above it is numbered 2, and so on till the topmost floor is numbered 6. Exactly three persons live between the floors of R and Q. T lives on the floor immediately above P's floor. U lives on the floor immediately above Q's floor. R lives on the floor immediately below S's floor. T lives on floor number 4. Q does not live on floor number 5. Who lives on floor number 6?