Civil Service Exam Reviewer · Logical Reasoning · hard
One of four employees forgot to turn off the aircon in the office overnight. When the supervisor asked, each one made a statement: • Karen: "I did not do it." • Gino: "It was either Tess or Rey." • Tess: "I did not do it." • Rey: "It was either me or Gino." Only one of them is telling the truth. Who is telling the truth?
- Karen
- Gino
- Tess
- Rey
Answer
C. Tess
Solution
Test each person as the one responsible and count the true statements: if Karen did it, 1 statement is true; if Gino did it, 3 statements are true; if Tess did it, 2 statements are true; if Rey did it, 4 statements are true. Only when Karen did it is exactly one statement true, so Karen is responsible. In that case the only true statement is Tess's, so Tess is telling the truth.
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