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Seven boxes, P, Q, R, S, X, Y and Z, are kept one over the other but not necessarily in the same order. Only P is kept above X. Only two boxes are kept between X and S. Only R is kept below Z. Y is not kept immediately above S. Which box is kept fourth from the top?
Q
X
Z
R
Q
Fix absolute anchors first. Here, 'Only P is kept above X' means X is at the 6th position from the top (just below P at 1st position). Then use spacing and relative clues to fill the rest.
Fix absolute anchors first. Here, 'Only P is kept above X' means X is at the 6th position from the top (just below P at 1st position). Then use spacing and relative clues to fill the rest.
Step 1: Position P and X
Only P is kept above X out of all 7 boxes. This means P must be at the 1st position (very top) and X must be immediately below P at the 2nd position, OR X is lower down. Wait, 'Only P is kept above X' means exactly one box is above X. Thus, X is at position 6 (leaving only P at position 1 above it).
Step 2: Position S using the gap
Only two boxes are kept between X and S. Since X is at position 6, S must be at position 3 (leaving boxes at positions 4 and 5 in between).
Step 3: Position Z and R
Only R is kept below Z. Since there are 7 boxes total and only R is below Z, Z must be at the 6th position from bottom (i.e. position 2) and R must be at position 7 (the bottommost box).
Step 4: Final placement of Y and Q
Remaining boxes are Q and Y. We are given that Y is not kept immediately above S. Since S is at position 3, Y cannot be at position 2. Therefore, Y must be at position 4 and Q at position 2. The full stack from top to bottom is: P, Q, Z, Y, S, X, R. The fourth box from the top is Y.
B: Q is second from the top. C: X is sixth from the top. D: Z is third from the top.
A is correct because box Y is placed at the fourth position from the top in the verified stack sequence (P, Q, Z, Y, S, X, R).
In ordering puzzles containing absolute constraints like 'only one box above X', immediately fix the positions of those elements before dealing with relative spacing clues.
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