Either Lily or Max left the light on. Lily was away all week. Which statement must be true?
Answer and explanation
Correct answer: B. Max left the light on.
- Step 1: One of the two children left the light on. Step 2. Lily was away, so she cannot have done it, which leaves Max. Answer: Max left the light on. Why not the others: Lily left the light on.: This contradicts the fact that she was away. Both children left the light on.: This is not supported; the first statement gives one of them. Neither child left the light on.: This contradicts the first statement.
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