__ lives on floor __ in flat 3.

O lives in flat 2 on odd numbered floor S lives above O in the same type of flat and to the east of T. 3. T doesn’t live on floor 3. So, O lives on flat 2 of floor 3 or flat 2 of floor 1. Case W: O lives on flat 2 of floor 3: Case II: O lives on flat 2 of floor 2: Case II(a): Q and V live in the same type of flat such that Q lives immediately above V but below floor 3. Q lives in southeast of T. X lives to the west of Q. X and U live in the same type of flat and X lives immediately above U, this is not possible in case II(b), so case II(b) is rejected. . U doesn’t live in flat 1, so case II(a) is rejected. So, X lives in flat 2 of floor 2 and U lives in flat 2 of floor 1. Q and V lives in flat 3.