Quiz: Puzzles

A,B,C,D read different books. A reads Physics; B reads Math; C reads Bio. D reads?

5 friends stand in a row. If A is left of B and B left of C — order left to right:

Weight: A>B>C>D. Heaviest?

4 boxes stacked; Red on top of Blue; Blue on Green; Yellow at bottom. Third from top:

P finishes before Q, Q before R. Order first→last:

A older than B, B younger than C. Who oldest — can't say?

Ram taller than Shyam. Shyam taller than Mohan. Shortest?

Days: Ali Mon, Ben Wed, Cara Fri, Dan?

Colors R,G,B,Y assigned to A,B,C,D uniquely. If A=R, B≠G, D=Y — B=?

Ranks: X 2nd, Y 5th, Z 3rd. Between X and Y: Z included?