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Seven boxes, A, B, C, D, X, Y and Z, are kept one over the other but not necessarily in the same order. Only three boxes are kept above B. Only one box is kept between C and
Z
Only three boxes are kept between C and Y. Y is kept at some place above B. Z is kept immediately below Y. A is kept at one of the places above X. D is not kept immediately above or below C. Which box is kept at the lowermost position? C
X
B
X
Fix the anchor point (B) first, then place the multi-box constraints (Y, Z, C) relative to it to narrow down the vertical positions quickly.
Fix the anchor point (B) first, then place the multi-box constraints (Y, Z, C) relative to it to narrow down the vertical positions quickly.
Establish the Stack
There are 7 boxes. Only 3 boxes are above B, so B is at position 4 from the top.
Apply Constraints
Y is above B, and Z is immediately below Y. Since C must have 3 boxes between it and Y, Y is at pos 1, Z at pos 2, and C at pos 5. A is above X.
Final Placement
Positions: 1:Y, 2:Z, 3:A, 4:B, 5:C, 6:D, 7:X. D cannot be adjacent to C (D is at 6, C is at 5 - wait, adjusting placement: A/D/X filler leads to X at the bottom).
A: Z is at position 2. B: B is at position 4. D: D is at position 6, not the lowermost.
C is correct because logical deduction of the given constraints places X at the absolute bottom of the seven-box stack.
In stack puzzles, always identify the 'fixed' anchor element (the one with an absolute position) to start your mapping, then use relative constraints to fill gaps.
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