X is elder than Z, Y is younger than Z, Z is elder than W :
X is elder than Z, Y is younger than Z, Z is elder than W, W is younger than X, who is the eldest?
(a) X
(b) Y
(c) W
(d) Z
Answer: (a) X
Explanation:-
X is elder than Z, Y is younger than Z, Z is elder than W, W is younger than X,
Then, X > W > Z > Y
So, X is the eldest.
Hence, the correct answer is option (a) X.