Seven tenants S, T, U, V, W, X and Y each occupy one floor of a seven-storey apartment block (floor 1 is the ground floor and floor 7 the top). V lives on the top floor and W on the ground floor. Y lives immediately above W. X lives on floor 4. Exactly one person lives between X and T, and T lives above X. U lives immediately below T. How many people live between W and U?

Question

Accepted Answer

Three. Arrangement (floor 1 → 7): W, Y, S, X, U, T, V. (T is two floors above X, so T = 6 and U = 5; S takes floor 3.) W is on floor 1 and U on floor 5, so Y, S and X (three people) live between them.

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