Seven people H, I, J, K, W, Y and Z are sitting in a row facing north. Only J sits to the left of W. Only four people sit between J and Y. Only I sits between K and H and K is not an immediate neighbor of Y. How many people sit to the right of Z?
None
Number seven seats 1 to 7 from left to right (all face north). Only J sits to the left of W means J is the only person on W's left, so J is at seat 1 and W is at seat 2.
Only four people sit between J and Y: with J at seat 1, four people between places Y at seat 6.
Only I sits between K and H means the block is K-I-H (or H-I-K) occupying three consecutive seats. The seats still free are 3, 4, 5 and 7. Three consecutive free seats are 3, 4, 5, so K, I, H take seats 3, 4, 5 with I in the middle at seat 4.
K is not an immediate neighbour of Y (seat 6). Seat 5 is adjacent to seat 6, so K cannot be at seat 5; hence K is at seat 3 and H is at seat 5, with I at seat 4.
The only seat left is seat 7, which must be Z. So the row is J, W, K, I, H, Y, Z.
Z is at the extreme right seat 7, so no one sits to its right.
Hence, none sit to the right of Z.
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