Five buses (Blue, Yellow, Green, Black, Red) stand in a row facing South. Black is immediately to the right of Red. Green is between Blue and Yellow. Yellow is between Black and Green. Which bus is exactly in the middle?

Introduction / Context:
We must arrange five colored buses left-to-right in a straight line consistent with “between” and “immediate right” constraints. The fact they face South does not change left-to-right linear positions (only personal left/right hands).

Given Data / Assumptions:

• Black immediately to the right of Red ⇒ pattern R–B.
• Green between Blue and Yellow.
• Yellow between Black and Green.

Concept / Approach:
Two “between” relations nest to create the chain Blue – Green – Yellow – Black in that order. Then place Red immediately to the left of Black without breaking the “between” conditions.

Step-by-Step Solution:
Start with Blue, Green, Yellow, Black (this satisfies both “between” clauses).To satisfy “Black immediately right of Red,” insert Red just before Black.Final order: Blue, Green, Yellow, Red, Black.The middle (3rd) position is Yellow.

Verification / Alternative check:
Check: Green is between Blue and Yellow (yes). Yellow is between Black and Green (yes). Black is immediately to the right of Red (yes).

Why Other Options Are Wrong:
They do not sit in the central position in any order meeting all three constraints.

Common Pitfalls:
Reversing the “between” order or placing Red so that Yellow is no longer between Black and Green.

Final Answer:
Yellow