Systematic Analysis of Book Attributes

To solve this puzzle, the clearest method is to create a table to track the three attributes (Cover Color, Condition, Type) for each of the six books (A, B, C, D, E, F).

1. Populating the Table from Clues

• Cover Color: "Books B, C, E and F have green covers while others have yellow covers."
  → A, D are Yellow; B, C, E, F are Green.
• Condition: "Books A, B and D are new while the rest are old volumes."
  → A, B, D are New; C, E, F are Old.
• Type: "Books A, B and C are law reports while the rest are medical extracts."
  → A, B, C are Law; D, E, F are Medical.

2. The Completed Table

3. Finding the Required Books

The question asks for the books that satisfy all three of the following conditions:

1. Condition is Old.
2. Type is Medical Extract.
3. Cover Color is Green.

By looking at the table, we can see that only books E and F meet all three criteria.

Conclusion

The two books that are old medical extracts and have green covers are E and F.