Civil Service Exam Reviewer · Logical Reasoning · medium
One of four employees forgot to turn off the aircon in the office overnight. When the supervisor asked, each one made a statement: • Hazel: "Carlo did it." • Leo: "I did not do it." • Carlo: "It was either Leo or Hazel." • Pia: "I did not do it." Only one of them is telling the truth. Who is responsible?
- Hazel
- Leo
- Carlo
- Pia
Answer
D. Pia
Solution
Test each person as the one responsible and count the true statements: if Hazel did it, 3 statements are true; if Leo did it, 2 statements are true; if Carlo did it, 3 statements are true; if Pia did it, 1 statement is true. Only when Pia did it is exactly one statement true, so Pia is responsible.
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