Question
How many persons live below A (considering both types of
flats)? Answer the questions based on the information given below: Ten persons namely, A, P, C, Q, E, R, G, S, I and T live on 10 different flats of a 5 storey building, where the bottommost floor is 1 and the floor above is 2 and so on. There are 2 types of flats on each floor, flat Y and flat Z such that flat Y is in the west of flat Z. Flat Y of floor 1 is immediately below of flat Y of floor 2, which is immediately below of flat Y of floor 3 and so on, similarly for flat Z. P lives in flat Y. P and R live in the same type of flat. Two floors are there between the floors of P and R. R lives exactly in the west of G. P lives on the even numbered floor. I's floor is immediately above G's floor. I and E live in the same type of flat. There is one floor between the floors of I and E. Q's floor is just below S's floor. T lives above A. C doesn’t live in flat Z. S and T don't live in same type of flat.Solution
P live in flat Y of either floor 2 or floor4. I lives on a floor that is immediately above the floor of G. I and E live in the same type of flat. P and R lives in same flat. There is one floor between the floors of I and E.So,I lives in either flat Y or flat Z. Case1:When P lives on 2nd floor. G cannot be placed in this case, so this case is not possible. 
Q's floor is just below S's floor. Case2: When Plives on4th floor It means that E lives on 4th floor and since I and E live in the same type of flat, I lives in Flat-Z on 2nd floor. Thus Q lives in flat-Y on 2nd floor. 
T lives above A. C doesn’t live in flat Z. S and T don'tlivein sametype offlat. So, T must live in flat Z which implies that S lives in flat Y and thus C lives in flat Y and A lives in Flat Z on 3rdfloor. The final arrangement is as follows: 
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