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Seven boxes, R, S, T, U, X, Y and Z, are kept one over the other but not necessarily in the same order. Only T is kept above X. Only Z is kept between X and Y. Only U is kept below R. How many boxes are kept between S and U?
Four
Three
Two
One
One
Determine the fixed reference (T is above X) and slot other boxes around it; only one person (S or U) remains to be placed in the final empty spots.
Determine the fixed reference (T is above X) and slot other boxes around it; only one person (S or U) remains to be placed in the final empty spots.
Placement Deduction
T is above X. Z is between X and Y, implying sequence X-Z-Y. Only U is kept below R, which forces the R-U block to be at the bottom.
Final Sequence Mapping
Combining clues: T, X, Z, Y, R, U. With 7 boxes and 'S' being the remaining one, it fits into the available slots. The final stack order is T, X, Z, Y, S, R, U (or variants involving S location, but S and U separation logic remains stable).
Verifying S and U
Based on the constraints, placing S between Y and R leads to: T, X, Z, Y, S, R, U. Between S (5th) and U (7th), only R (6th) is present. Thus, one box.
A: Four boxes is physically impossible based on the stack limits. B: Three boxes overestimates the gap. C: Two boxes ignores that R is explicitly between S and U.
D is correct because based on the constraints T-X-Z-Y, and the bottom block R-U, the box S must be placed such that exactly one box (R) exists between S and U.
In stack puzzles, always identify the 'anchor' block (e.g., R-U) first as it restricts the vertical movement significantly.
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