P is heavier than Q. R is lighter than Q. S is heavier than P. Who is the lightest?
- A. P
- B. Q
- C. R
- D. S
Explanation
The chain gives R lighter than Q, Q lighter than P and P lighter than S, so the order from lightest is R, Q, P, S. Building one line and inserting each new name as its clue is read keeps the ordering straight. R sits at the bottom of that line.
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