Question

Six friends, R, S, T, X, Y and Z, are sitting in a straight row facing north (but not necessarily in the same order). Only two people sit to the left of Y. Only two people sit between Y and Z. Only one person sits between Z and X. R sits to the immediate left of S. How many people sit between Y and S ?

• A. Two
• B. Three
• C. Zero
• D. One

Answer 1

Answer:

C. Zero

Let’s arrange step by step.

We have 6 seats in a row (facing north):

Positions: 1 2 3 4 5 6

Place Y

“Only two people sit to the left of Y”
→ Y is at position 3

Place Z

“Only two people sit between Y and Z”
→ Y at 3 → Z can be at position 6 (3 people apart → 2 in between)

Place X

“Only one person sits between Z and X”
→ Z at 6 → X must be at position 4

Place R and S

“R sits immediately to the left of S”

Remaining positions: 1, 2, 5

Possible pairs:

• (1,2) → R=1, S=2

• (2,5) not adjacent

• (5,?) no space

So:

• R = 1

• S = 2

• Remaining person T

Only position left = 5

Final arrangement:

1 R
2 S
3 Y
4 X
5 T
6 Z

Question:

How many people sit between Y (3) and S (2)?

→ No one sits between them

Final Answer: 0