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| Lefties and righties (Posted on 2015-06-10) |
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In Leftwrite, every inhabitant is either a lefty or a righty. Lefties write true statements with their left hand and false statements with their right hand. Righties write false statements with their left hand and true statements with their right hand. An inhabitant wrote, "My father and I are both lefties." With the same hand, he wrote, "My father is a righty." What type is the inhabitant, what type is his father, and what hand did he write the statements with?
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Submitted by Math Man
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Rating: 4.6667 (3 votes)
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Solution:
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Since the statements were written with the same hand, they are either both true or both false. They cannot both be true, so they are both false. Therefore, his father is a lefty. Also, they are not both lefties, so the inhabitant is a righty. Since the statements are false, he wrote them with his left hand.
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