Seven boys, P, Q, R, S, T, U and V, sit in a row facing North. T sits fourth to the left of R. T does not sit at either end of the row. U sits in the middle of the row. S sits third to the right of V. P is not an immediate neighbour of V.
Who sits to the immediate right of S?
Answer & explanation
Correct answer: option 4
The correct answer is Option (4) → P
Number the seats 1 to 7 from the left. A gap of four seats leaves only a few places for T and R, so fix them first.
T is fourth to the left of R, so (T, R) is (1, 5), (2, 6) or (3, 7); T is not at an end, so (T, R) is (2, 6) or (3, 7)
U is in the middle, seat 4
S is third to the right of V, so (V, S) is one of (1, 4), (2, 5), (3, 6), (4, 7):
If T is in seat 2 and R in seat 6, every one of these pairs uses a taken seat, so this case fails
So T is in seat 3 and R in seat 7; then only (2, 5) is free: V in seat 2, S in seat 5
Seats 1 and 6 are left for P and Q. P is not next to V, so P is not in seat 1: P is in seat 6 and Q in seat 1
The row is Q, V, T, U, S, P, R, so the boy to the immediate right of S is P
