Six people A, B, C, D, E and F live on six different floors of the same building. The bottom-most floor of the building is numbered as 1, the floor above it is numbered as 2 and so on. The topmost floor is numbered as 6. A lives on an even-numbered floor. Only three people live between A and B. F lives immediately above E. B does not live on floor number 2. Only two people live between F and D. F lives on an even-numbered floor. Who lives on floor number 3?

A, G, H, P, S and Y 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. Only three people live between Y and H, where Y lives below H. G lives on an odd-numbered floor and immediately above Y. S lives on one of the floors below A and on one of the floors above P. Who lives on the floor numbered 5?

M, N, O, W, X and Y 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. Only two people live between N and X. Only two people live between W and M. Only one person lives between Y and M. Y lives on floor numbered 1. N lives above M. How many people live below O?