CAT 1993 — DILR Question 6
Refer to the following information and answer the questions that follow.
“Kya – Kya” is an island in the South Pacific. The inhabitants of “Kya – Kya” always answer any question with two sentences, one of which is always true and the other always false.
There is only one pilot on the island. You interview three men, Koik, Lony and Mirna. You also notice that Koik is wearing a cap.
Mirna says, “Lony’s father is the pilot. Lony is not the priest’s son.”
Koik says, “I am the priest. On this island, only priests can wear caps.”
Lony says, “I am the priest’s son. Koik is not the priest.”
Which of the following is true?
Answer & solution
- A
Lony is not Koik’s son.
Koik is the pilot.
- C
Mirna is the pilot.
- D
Lony is the priest.
The best way to solve these kinds of questions is to assume that one of the statements is either true or false and thus figure out whether there is consistency in what everyone is saying.
The key here are the statements made by Koik. Since we know that he is wearing a cap, if his first statement is false, then his second statement cannot be true. So his first statement is true and his second statement is false. This implies that Koik is the priest. This makes Lony’s second statement false and so his first statement is true. So Lony is Koik’s son. This makes Mirna’s second statement false and so his first statement is true. So Lony’s father is a pilot. Thus, Koik is the pilot. (Note: Koik is also the priest).