Five books are stacked. The physics book is above the chemistry book. The biology book is below the chemistry book. Which book is lowest of these three?
- A. physics
- B. chemistry
- C. biology
- D. cannot be determined
Explanation
The order from top downwards runs physics, chemistry, biology, so biology sits lowest of the three named. Stacking puzzles work like vertical seating rows and are solved the same way, by building one ordered line. The two unnamed books could sit anywhere without changing this relationship.
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