Question 1
Seven people A, B, C, D, E, F, G sit in a row facing north.
- A is at the extreme left.
- C is fourth from the left.
- B is immediately to the right of C.
- G is at the extreme right.
- F is immediately to the left of G.
- D is immediately to the right of A.
Who sits in the exact middle?
Show solution
A(1), C(4), B immediately right of C → B(5), G(7), F immediately left of G → F(6), D immediately right of A → D(2). The only remaining seat is 3, filled by E. Order: A, D, E, C, B, F, G Q1: Middle (position 4) → C Q2: Immediately right of D(2) → E Q3: Between A(1) and E(3): position 2 → 1 person Q4: Neighbours of B(5) → C and F
Question 2
Seven people A, B, C, D, E, F, G sit in a row facing north.
- A is at the extreme left.
- C is fourth from the left.
- B is immediately to the right of C.
- G is at the extreme right.
- F is immediately to the left of G.
- D is immediately to the right of A.
Who is immediately to the right of D?
Show solution
A(1), C(4), B immediately right of C → B(5), G(7), F immediately left of G → F(6), D immediately right of A → D(2). The only remaining seat is 3, filled by E. Order: A, D, E, C, B, F, G Q1: Middle (position 4) → C Q2: Immediately right of D(2) → E Q3: Between A(1) and E(3): position 2 → 1 person Q4: Neighbours of B(5) → C and F
Question 3
Seven people A, B, C, D, E, F, G sit in a row facing north.
- A is at the extreme left.
- C is fourth from the left.
- B is immediately to the right of C.
- G is at the extreme right.
- F is immediately to the left of G.
- D is immediately to the right of A.
How many people sit between A and E?
Show solution
A(1), C(4), B immediately right of C → B(5), G(7), F immediately left of G → F(6), D immediately right of A → D(2). The only remaining seat is 3, filled by E. Order: A, D, E, C, B, F, G Q1: Middle (position 4) → C Q2: Immediately right of D(2) → E Q3: Between A(1) and E(3): position 2 → 1 person Q4: Neighbours of B(5) → C and F