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Five people, P, Q, R, S, and T, live in the houses 21, 23, 25, 27, 29: R lives just above Q; P is the lowest; S lives above R but not the highest; T is the highest.
Who lives at house 27?
R
S
Q
T
S
Fix the anchor points first (P is lowest, T is highest) and chain the remaining three (S-R-Q) into the available middle slots.
Fix the anchor points first (P is lowest, T is highest) and chain the remaining three (S-R-Q) into the available middle slots.
Establish boundaries
Houses are 21, 23, 25, 27, 29. P is lowest (21). T is highest (29).
Arrange remaining
We have 23, 25, 27 left for Q, R, S. R is just above Q (R, Q). S is above R but not highest, meaning order is S, R, Q. Placing S, R, Q into 27, 25, 23 matches all criteria.
Final distribution
P=21, Q=23, R=25, S=27, T=29. Therefore, S is at 27.
A: R lives in 25, not 27. C: Q lives in 23, not 27. D: T lives in 29, not 27.
B is correct because mapping the constraints places P at 21, Q at 23, R at 25, S at 27, and T at 29, confirming S resides in house 27.
In floor-based puzzles, always place the extreme positions (highest/lowest/top/bottom) first to reduce the available search space for middle elements.
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