Enigma 537: The three sisters
17 February 2020
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From New Scientist #1689, 4th November 1989 [link] [link]
Sarah, Tora and Ursula are three sisters. One of them is honest, one always lies, and the third is simply unreliable.
Tora told me that the youngest of the three is fatter than the liar, and the oldest of the three told me that the fattest is older than the honest one. But Ursula and the thinnest sister both agreed that the oldest sister always lies.
The fattest sister and the oldest sister both agreed that Sarah always lies. Then the youngest sister whispered to Sarah who then claimed that the youngest had said that Ursula was the fattest.
Who is the honest sister?
Who is the fattest sister?
Who is the youngest sister?